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Calculate the pH of the following solutions A) 0.10 M hydrogen sulfide? B) 1.0*10^-4 M benzoic acid (check Ca/Ka ratio)? C) 0.09 M methylamine D) Ammonium carbonate (is it acidic or basic - actual pH not necessary)? E) 50. mL of 0.15 M nitric acid added to 100. mL of 0.05 M KOH? F) At the equivalence point when 50.0 mL of 0.16 M hydrazine is titrated with 0.10 M HCL?

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