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What is the pH of a 0.018 mol L$^{-1}$ solution of hydrochloric acid? (A) 0.74 (B) 0.96 (C) 1.04 (D) 1.74 - HSC - SSCE Chemistry - Question 18 - 2060 - Paper 1

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Question 18

What-is-the-pH-of-a-0.018-mol-L$^{-1}$-solution-of-hydrochloric-acid?--(A)-0.74-(B)-0.96-(C)-1.04-(D)-1.74-HSC-SSCE Chemistry-Question 18-2060-Paper 1.png

What is the pH of a 0.018 mol L$^{-1}$ solution of hydrochloric acid? (A) 0.74 (B) 0.96 (C) 1.04 (D) 1.74

Worked Solution & Example Answer:What is the pH of a 0.018 mol L$^{-1}$ solution of hydrochloric acid? (A) 0.74 (B) 0.96 (C) 1.04 (D) 1.74 - HSC - SSCE Chemistry - Question 18 - 2060 - Paper 1

Step 1

Calculate the pH

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Answer

Hydrochloric acid (HCl) is a strong acid that completely dissociates in aqueous solution. Therefore, the concentration of hydrogen ions, [H+^+], is equal to the concentration of hydrochloric acid:

[H+]=0.018 mol L−1[H^+] = 0.018 \, \text{mol L}^{-1}

To find the pH, use the formula:

pH=−log⁡10([H+])pH = -\log_{10}([H^+])

Substituting the values:

pH=−log⁡10(0.018)≈1.74pH = -\log_{10}(0.018) \approx 1.74

Thus, the correct answer is (D) 1.74.

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