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Asked by Prashant DIGHE | 13 Jun, 2020, 10:21: PM
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71. Neutralisation equation-
 HCl plus NaOH rightwards arrow NaCl space plus straight H subscript 2 straight O straight n equals 100 cross times 1 equals 100 space straight m space mole equals 0.1 space mole Energy space evolved space due space to space neutralization space of space HCl space and space NaOH space equals 0.1 cross times 57 equals 5.7 space KJ equals 5700 space Joule Energy space used space to space increase space temperature space of space solution equals 200 cross times 4.2 cross times 5.7 equals 4788 space Joule Energy space used space to space increase space temperature space of space calorimeter equals 5700 minus 4788 equals 912 space Joule ms. increment straight T equals 912 ms cross times 5.7 equals 912 ms equals 160 space Joule divided by ring operator Energy space evolved space by space neutralization space of space CH subscript 3 COOH space and space NaOH equals 200 cross times 4.2 cross times 5.6 plus 160 cross times 5.6 equals 5600 space Joule so comma space energy space used space in space dissociation space of space 0.1 space mole space CH subscript 3 COOH space equals 5700 minus 5600 equals 100 space Joule Enthalpy space of space dissociation space equals 1 space KJ divided by mole 72. left square bracket CH subscript 3 COOH right square bracket equals fraction numerator 1 cross times 100 over denominator 200 end fraction equals 1 half left square bracket CH subscript 3 CONa right square bracket equals fraction numerator 1 cross times 100 over denominator 200 end fraction equals 1 half pH equals pK subscript straight a plus log fraction numerator left square bracket Salt right square bracket over denominator left square bracket Acid right square bracket end fraction pH equals 5 minus log 2 plus log fraction numerator 1 half over denominator 1 half end fraction pH equals 4.7
Answered by Ravi | 14 Jun, 2020, 06:45: PM

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CBSE 11-science - Chemistry
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CBSE 11-science - Chemistry
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CBSE 11-science - Chemistry
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CBSE 11-science - Chemistry
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CBSE 11-science - Chemistry
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Asked by prakriti12oct | 26 Sep, 2019, 01:40: AM
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CBSE 11-science - Chemistry
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CBSE 11-science - Chemistry
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CBSE 11-science - Chemistry
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