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Dissociation (chemistry)

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A strong electrolyte is a solute that exists in solution completely or nearly completely as ions. Again, the strength of an electrolyte is defined as the percentage of solute that is ions, rather than molecules. The higher the percentage, the stronger the electrolyte. Thus, even if a substance is not
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is the fraction of original solute molecules that have dissociated. It is usually indicated by the Greek symbol α. More accurately, degree of dissociation refers to the amount of solute dissociated into ions or radicals per mole. In case of very strong acids and bases, degree of dissociation will be
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constant. In fact, increasing the pressure of the equilibrium favours a shift to the left favouring the formation of dinitrogen tetroxide (as on this side of the equilibrium there is less pressure since pressure is proportional to number of moles) hence decreasing the extent of dissociation
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A weak electrolyte is a substance whose solute exists in solution mostly in the form of molecules (which are said to be "undissociated"), with only a small fraction in the form of ions. Simply because a substance does not readily dissolve does not make it a weak electrolyte.
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very soluble, but does dissociate completely into ions, the substance is defined as a strong electrolyte. Similar logic applies to a weak electrolyte. Strong acids and bases are good examples, such as HCl and
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medium. Most of the solute does not dissociate in a weak electrolyte, whereas in a strong electrolyte a higher ratio of solute dissociates to form free ions.
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COOH. The double arrow means that this is an equilibrium process, with dissociation and recombination occurring at the same time. This implies that the
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close to 1. Less powerful acids and bases will have lesser degree of dissociation. There is a simple relationship between this parameter and the
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will remain constant with temperature. The addition of pressure to the system will increase the value of
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of the ligand to the receptor. The higher the affinity of the ligand for the receptor the lower the
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or formation of ions (for the case when HA has no net charge). The equilibrium constant is then
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is not included because in dilute solution the solvent is essentially a pure liquid with a
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refers to the percentage of gas molecules which dissociate. Various relationships between
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The reaction of an acid in water solvent is often described as a dissociation
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Separation of molecules or ionic compounds into smaller constituent entities
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where the brackets denote the equilibrium concentrations of the species.
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Petrucci, Ralph H.; Harwood, William S.; Herring, F. Geoffrey (2002).
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refers to a substance that contains free ions and can be used as an
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is a general process in which molecules (or ionic compounds such as
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If the initial concentration of dinitrogen tetroxide is 1 
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However a more explicit description is provided by the
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is the ratio of dissociated to undissociated compound
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General chemistry: principles and modern applications
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H+ does not exist as such in solution but is instead
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Unsourced material may be challenged and removed. 2262: 2075: 2029: 1923: 1777: 1681: 1543: 1366: 1110: 972: 670: 638: 609: 518: 468: 447: 422: 391: 307: 2210:, dissociation of molecules by ionizing radiation 1873: 1872: 1855: 1854: 1692:where HA is a proton acid such as acetic acid, CH 1644: 1643: 1626: 1625: 941: 940: 923: 922: 572: 571: 554: 553: 284: 283: 266: 265: 2326: 1009:(in terms of pressure) is given by the equation 2309:Physical Chemistry with Biological Applications 2030:{\displaystyle K_{\ce {a}}={\ce {\frac {}{}}}} 1778:{\displaystyle K_{\ce {a}}={\ce {\frac {}{}}}} 610:{\displaystyle {\ce {KCl <=> K+ + Cl-}}} 2135:of a molecule can take place by a process of 1316: 1289: 1210: 1183: 1060: 1037: 709:crystals dissolving and dissociating in water 529:For instance, for the following dissociation 1800:by (bonded to) a water molecule to form the 1682:{\displaystyle {\ce {HA <=> H+ + A-}}} 1590: 1376:The total number of moles at equilibrium is 973:{\displaystyle {\ce {N2O4 <=> 2NO2}}} 456:. If the solute substance dissociates into 392:{\displaystyle K_{d}=\mathrm {\frac {}{}} } 308:{\displaystyle {\ce {AB <=> A + B}}} 212:, which gives a proton (H) and a negative 1811:The reaction can therefore be written as 1332: 1297: 1239: 1191: 1076: 994:at equilibrium giving, by stoichiometry, 955: 127:Learn how and when to remove this message 2231: 2229: 691: 227: 1848: 1619: 916: 547: 259: 14: 2327: 405: 208:atom and a hydrogen atom is broken by 2226: 2256: 2254: 2252: 1553:This equation is in accordance with 1135:to represent the total pressure and 65:adding citations to reliable sources 36: 24: 380: 377: 366: 357: 238:For reversible dissociations in a 216:. Dissociation is the opposite of 25: 2351: 2249: 2239:(8th ed. W.H.Freeman 2006) p.763 2311:(Benjamin/Cummings) 1978, p.307 2127: 852:of the equation. The example of 519:{\displaystyle i=1+\alpha (n-1)} 160: 143: 41: 1790:Brønsted–Lowry acid–base theory 733:. The salt can be recovered by 52:needs additional citations for 2299: 2068: 2049: 2021: 2015: 2009: 1996: 1991: 1965: 1875: 1850: 1769: 1763: 1757: 1744: 1739: 1726: 1646: 1621: 1517: 1501: 1479: 1467: 1464: 1452: 1447: 1431: 943: 918: 825:The degree of dissociation in 725:, means the separation of the 574: 549: 513: 501: 383: 374: 369: 363: 360: 354: 286: 261: 13: 1: 2219: 713:The dissociation of salts by 76:"Dissociation" chemistry 2169:is used as indicator of the 2162:. The dissociation constant 2146: 7: 2190: 2180:value (and the higher the p 1934:and better described as an 1792:, which specifies that the 671:{\displaystyle i=1+\alpha } 10: 2356: 2235:Atkins P. and de Paula J. 1698:acid dissociation constant 1597:Acid dissociation constant 1594: 685: 231: 29: 1591:Acids in aqueous solution 1387:, which is equivalent to 829:is denoted by the symbol 2197:Bond-dissociation energy 2100:acid ionization constant 2076:{\displaystyle {\ce {}}} 1555:Le Chatelier's principle 990:, this will decrease by 820: 681: 410:The dissociation degree 167:Dissociation diagram of 848:exist depending on the 748:electrically conductive 423:{\displaystyle \alpha } 2085:thermodynamic activity 2077: 2031: 1925: 1779: 1683: 1575:must decrease to keep 1545: 1368: 1112: 974: 710: 688:Solubility equilibrium 672: 640: 611: 520: 470: 449: 424: 393: 309: 200:dissolves in water, a 2340:Equilibrium chemistry 2214:Thermal decomposition 2096:dissociation constant 2094:is variously named a 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2163: 2150: 2131: 2118: 2111: 2107: 2103: 2099: 2095: 2089: 2039: 1935: 1933: 1810: 1797: 1793: 1787: 1691: 1600: 1552: 1390: 1383: 1379: 1375: 1119: 981: 824: 804: 752: 741: 739: 712: 619: 528: 435: 409: 401: 322: 317: 237: 221: 217: 178:Dissociation 177: 176: 123: 114: 104: 97: 90: 83: 71: 59:Please help 54:verification 51: 32:Dissociation 2137:heterolysis 756:Acetic acid 743:electrolyte 735:evaporation 705:A video of 476:ions, then 218:association 204:between an 18:Dissociated 2329:Categories 2285:2001032331 2220:References 2208:Radiolysis 1936:ionization 721:, such as 686:See also: 87:newspapers 2152:Receptors 2147:Receptors 2141:homolysis 2005:− 1916:− 1876:⇀ 1869:− 1858:− 1851:↽ 1802:hydronium 1753:− 1674:− 1647:⇀ 1640:− 1629:− 1622:↽ 1530:α 1526:− 1509:α 1477:α 1474:− 1462:α 1439:α 1234:⋅ 998:moles of 944:⇀ 937:− 926:− 919:↽ 790:and some 715:solvation 666:α 602:− 575:⇀ 568:− 557:− 550:↽ 508:− 499:α 418:α 287:⇀ 280:− 269:− 262:↽ 190:complexes 182:chemistry 117:June 2014 2293:46872308 2191:See also 2187:value). 2171:affinity 2156:proteins 2124:value). 2087:of one. 1798:accepted 833:, where 768:ammonium 719:solution 194:radicals 2160:ligands 731:cations 101:scholar 2315:  2291:  2283:  2273:  2243:  2106:or an 2040:where 1794:proton 1120:where 1005:. The 766:) and 727:anions 103:  96:  89:  82:  74:  2102:, an 2098:, an 1804:ion H 1571:, so 1382:) + 2 1378:(1 – 988:litre 827:gases 821:Gases 723:water 717:in a 682:Salts 188:, or 186:salts 108:JSTOR 94:books 2313:ISBN 2289:OCLC 2281:LCCN 2271:ISBN 2241:ISBN 2154:are 1389:1 + 986:per 984:mole 844:and 798:and 788:COOH 764:COOH 729:and 318:the 198:acid 80:news 2139:or 1808:O. 796:COO 740:An 620:As 541:KCl 220:or 214:ion 180:in 63:by 2331:: 2287:. 2279:. 2251:^ 2228:^ 2143:. 2019:HA 1823:HA 1767:HA 1613:HA 1587:. 1557:. 1301:NO 1195:NO 1143:; 1045:NO 1000:NO 958:NO 873:NO 812:SO 802:. 792:CH 784:CH 772:NH 760:CH 678:. 598:Cl 253:AB 224:. 2295:. 2185:d 2182:K 2178:d 2175:K 2167:d 2164:K 2122:a 2119:K 2115:a 2112:K 2092:a 2090:K 2069:] 2066:O 2058:2 2054:H 2050:[ 2022:] 2016:[ 2010:] 2001:A 1997:[ 1992:] 1987:+ 1983:O 1974:3 1970:H 1966:[ 1959:= 1954:a 1950:K 1912:A 1908:+ 1903:+ 1899:O 1890:3 1886:H 1842:O 1834:2 1830:H 1826:+ 1806:3 1770:] 1764:[ 1758:] 1749:A 1745:[ 1740:] 1735:+ 1731:H 1727:[ 1720:= 1715:a 1711:K 1694:3 1670:A 1666:+ 1661:+ 1657:H 1585:α 1579:p 1577:K 1573:α 1568:T 1566:p 1561:p 1559:K 1534:2 1523:1 1518:) 1513:2 1505:4 1502:( 1497:T 1493:p 1486:= 1480:) 1471:1 1468:( 1465:) 1459:+ 1456:1 1453:( 1448:) 1443:2 1435:4 1432:( 1427:T 1423:p 1416:= 1411:p 1407:K 1396:α 1391:α 1384:α 1380:α 1353:4 1349:O 1340:2 1336:N 1330:x 1323:2 1317:) 1305:2 1295:x 1290:( 1283:T 1279:p 1272:= 1260:4 1256:O 1247:2 1243:N 1237:x 1229:T 1225:p 1217:2 1211:) 1199:2 1189:x 1184:( 1177:2 1172:T 1168:p 1161:= 1156:p 1152:K 1137:x 1132:T 1130:p 1122:p 1097:4 1093:O 1084:2 1080:N 1074:p 1067:2 1061:) 1049:2 1038:( 1033:p 1027:= 1022:p 1018:K 1002:2 996:α 992:α 962:2 953:2 905:4 901:O 892:2 888:N 875:2 871:( 864:4 862:O 860:2 858:N 856:( 846:α 841:p 839:K 835:α 831:α 814:4 810:2 808:H 800:H 794:3 786:3 778:4 775:+ 770:( 762:3 758:( 663:+ 660:1 657:= 654:i 634:2 631:= 628:n 594:+ 589:+ 585:K 514:) 511:1 505:n 502:( 496:+ 493:1 490:= 487:i 464:n 443:i 384:] 381:B 378:A 375:[ 370:] 367:B 364:[ 361:] 358:A 355:[ 349:= 344:d 340:K 326:d 323:K 302:B 299:+ 296:A 130:) 124:( 119:) 115:( 105:· 98:· 91:· 84:· 57:. 34:. 20:)

Index

Dissociated
Dissociation

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Dissociation of Gomberg's dimer
Gomberg's dimer
Dissociation diagram of phosphoric acid
phosphoric acid
chemistry
salts
complexes
radicals
acid
covalent bond
electronegative
heterolytic fission
ion
Dissociation constant
chemical equilibrium
dissociation constant
van 't Hoff factor

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