Question 48 of 69intermediate🔧 ApplyNumerical3 marks

Calculate the pH of the following solutions: a) 2 g of TlOH dissolved in water to give 2 litre of solution. b) 0.3 g of Ca(OH)2_2 dissolved in water to give 500 mL of solution. c) 0.3 g of NaOH dissolved in water to give 200 mL of solution. d) 1 mL of 13.6 M HCl is diluted with water to give 1 litre of solution.

(a)
Answer

11.65

(b)
Answer

12.21

(c)
Answer

12.57

(d)
Answer

1.87

Explanation

To calculate the pH of the given solutions, we first determine the molarity of the hydroxide ions ([OH−][OH^-]) or hydronium ions ([H3O+][H_3O^+]). For basic solutions, we calculate pOH=−log⁡[OH−]pOH = -\log[OH^-] and then use the relation pH+pOH=14pH + pOH = 14 (since Kw=10−14K_w = 10^{-14}). For acidic solutions, we directly use pH=−log⁡[H3O+]pH = -\log[H_3O^+].

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