Calculate \( \mathrm{pH} \) of following solutions : (a) \( 0.08 \mathrm{M} \mathrm{H}_{2} \math...

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Calculate \( \mathrm{pH} \) of following solutions :
(a) \( 0.08 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}(50 \mathrm{ml})+0.04 \mathrm{M} \mathrm{HCl} 50(\mathrm{ml}) \)
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(b) \( 0.1 \mathrm{M} \mathrm{HA}+0.1 \mathrm{M} \mathrm{HB}\left[\mathrm{K}_{\mathrm{a}}(\mathrm{HA})=2 \times 10^{-5} ; \mathrm{K}_{\mathrm{a}}(\mathrm{HB})=4 \times 10^{-5}\right] \)
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