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Species concentrations in a solution of a weak diprotic acid

This type of question, asked 2 times: 21 Jan 2026 S2, 2 Apr 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    21 Jan 2026 S2

    46
    The first and second ionization constants of H2XH_{2}X are 2.5×10−82.5 \times 10^{- 8} and 1.0×10−131.0 \times 10^{- 13} respectively. The concentration of X2−X^{2 -} in 0.1MH2X0.1MH_{2}X solution is ____\_\_\_\_ ×10−15M\times 10^{- 15}M. (Nearest Integer)

  2. Question 2

    2 Apr 2026 S2

    27
    The first and second ionization constants of a weak dibasic acid H2 AH_{2}\text{ }A are 8.1×10−88.1 \times10^{- 8} and 1.0×10−131.0 \times10^{- 13} respectively. 0.1 mol of H2 AH_{2}\text{ }A was dissolved in 1L of 0.1 M HCl solution. The concentration of HA−HA^{-} in the resultant solution is :

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