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pH of a salt solution of a weak acid or a weak base (hydrolysis)

This type of question, asked 2 times: 25 Jul 2022, 24 Jan 2023. All 2 questions below, oldest first.

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  1. Question 1

    25 Jul 2022

    34
    20 mL20\text{ }mL of 0.1MNH4OH0.1MNH_{4}OH is mixed with 40 mL40\text{ }mL of 0.05MHCl0.05MHCl. The pHpH of the mixture is nearest to: (Given: Kb(NH4OH)=1×10−5,log⁡2=0.30K_{b}\left( NH_{4}OH \right)= 1 \times10^{- 5},\log2 = 0.30, log⁡3=0.48,log⁡5=0.69,log⁡7=0.84\log3 = 0.48,\log5 = 0.69,\log7 = 0.84, log⁡11=1.04)\log11 = 1.04)

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  2. Question 2

    24 Jan 2023

    145
    If the pKapKa of lactic acid is 5 , then the pHpH of 0.005M0.005M calcium lactate solution at 25∘C25^{\circ}C is___ ×10−1\times10^{- 1} (Nearest integer)