Common ion effect, hydrolysis of salts
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See all →- The pK_b of dimethylamine and pK_a of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is : Answer: 3. 7.75 Key idea: for a salt of a weak acid and a weak base, pH=7+1/2(pK_a-pK_b) . pH=7+1/2(4.77-3.27)=7+0.75=7.75 . 1
- HCl was passed through a solution of CaCl_2, MgCl_2 and NaCl. Which of the following compound(s) crystallise(s) ? Answer: 2. Only NaCl Passing HCl gas raises the Cl^- concentration. When the ionic product [Na^+][Cl^-] exceeds the solubility product of Na... 1