500 mL of a solution containing 3.70 g Ca(OH)2 (molar mass 74 g mol^-1) is mixed with 400 mL of 0.150 M H2SO4. Assume both are fully dissociated, volumes are additive, and ignore any precipitate. The pH of the mixture is closest to:

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$500 mL$ of a solution containing $3.70 g$ $Ca (OH) X_{2}$ (molar mass $74 g mo l^{- 1}$ ) is mixed with $400 mL$ of $0.150 M$ $H X_{2} SO X_{4}$ . Assume both are fully dissociated, volumes are additive, and ignore any precipitate. The pH of the mixture is closest to:

Equivalents of base

= 3.70/37 = 0.100

; equivalents of acid

= 0.400 \times 0.150 \times 2 = 0.120

. Excess acid

= 0.020

equivalent in

0.900 L

gives

[H X^{+}] = 0.02222 M

pH = - lo g (0.02222) = 1.65