It is no acid at all! KC2H3O2 is potassium acetate, of which the acetate anion C2H3O2- is a weak base, pKb = 9.22 and potassium ions are neutral, hence of no effect on pH.
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Kc2h3o2 is an acid because it contains the acetate ion, which can donate a proton (H+) in a solution, forming acetic acid. In water, the acetate ion can react with water molecules to produce hydronium ions (H3O+) and acetic acid, which makes it an acid.
The balanced chemical equation for neutralizing aqueous acetic acid (HC2H3O2) with aqueous potassium hydroxide (KOH) is: HC2H3O2 + KOH → KC2H3O2 + H2O This reaction forms potassium acetate (KC2H3O2) and water (H2O) when acetic acid reacts with potassium hydroxide in a 1:1 molar ratio.
The pH of the 0.1 M solution of NaC2H3O2 would be higher than that of the 0.1 M solution of KC2H3O2 as NaC2H3O2 is a strong base and will increase the pH, while KC2H3O2 is a weak acid and will decrease the pH.
CaSO4 and SrS are insoluble in water, while KC2H3O2 and AlPO4 are soluble in water.
Molar mass of KC2H3O2 = 98.14232 g/mol Molecular weight calculation: 39.0983 + 12.0107*2 + 1.00794*3 + 15.9994*2 See the 'sources and related links' at bottom of this answer. The site there works the molar mass out for you automatically, all you have to do is insert 'KC2H302')
KOH(aq)+HC2H3O2(aq)---- H2O(l)+KC2H3O2(aq)