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pH of a mixture of strong acid and strong base solutions

This type of question, asked 4 times: 2021 Paper 23, 29 Jul 2022, 30 Jan 2023, 5 Apr 2026 S1. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 23

    56
    The pHpH of a solution obtained by mixing 50 mL50\text{ }mL of 1MHCl1MHCl and 30 mL30\text{ }mL of 1MNaOH1MNaOH is x×10−4x \times10^{- 4}. The value of xx is ____\_\_\_\_. (Nearest integer) [ log⁡2.5=0.3979]\log2.5 = 0.3979\rbrack

  2. Question 2

    29 Jul 2022

    124
    200 mL200\text{ }mL of 0.01MHCl0.01MHCl is mixed with 400 mL400\text{ }mL of 0.01MH2SO40.01MH_{2}SO_{4}. The pHpH of the mixture is

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  3. Question 3

    30 Jan 2023

    51
    600 mL600\text{ }mL of 0.01MHCl0.01MHCl is mixed with 400 mL400\text{ }mL of 0.01MH2SO40.01MH_{2}SO_{4}. The pHpH of the mixture is____ ×10−2\times10^{- 2}. (Nearest integer) [Given log⁡2=0.30\log2 = 0.30
    log⁡3=0.48\log3 = 0.48
    log⁡5=0.69\log5 = 0.69
    log⁡7=0.84\log7 = 0.84
    log⁡11=1.04]\log11 = 1.04\rbrack

  4. Question 4

    5 Apr 2026 S1

    31
    Arrange the following resultant mixtures in increasing order of their pH values (A) 10 mL0.2MCa(OH)2+25 mL0.1MHCl10\text{ }mL0.2MCa(OH)_{2} + 25\text{ }mL0.1MHCl (B) 10 mL0.01MH2SO4+10 mL0.01MCa(OH)210\text{ }mL0.01MH_{2}{SO}_{4} + 10\text{ }mL0.01MCa(OH)_{2} (C) 10 mL0.1MH2SO4+10 mL0.1MKOH10\text{ }mL0.1MH_{2}{SO}_{4} + 10\text{ }mL0.1MKOH Choose the correct answer from the options given below :

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