16.34 write chemical equations for the acid ionizations of each of the following

Question

16.34 write chemical equations for the acid ionizations of each of the following weak acids (express these terms of Hsot) a HCO2H (formic acid b. HF bydrofluoric acid c. HN3 azoic acid) d. HoCN (cyanic acid) (hydr 16.38 Formic acid HCHO2 is used to make methyl formate (a fumigant for dried fruit and ethyl formate (as artificial rum flavor. What is the pHofa o 12M solution of formic acid? What is the degree of ionization of HCHO3 in this solution? See Table 16.1 for Kat is 0.25M trimethylamine has a pH of 11.63. What is Kbfor trimethylamine? 16.60 Note whether the aqueous solution of each of the following salts will be acidic, neutral, or basic. a. ammonium acetate b. anilinium acetate 16.66 Calculate the OH concentration and pHof a 0.0025 Maqueous solution of sodium cyanide, NaCN. Finally, obtain the hydronium-ion, CN, and HCN concentrations 16.74 What is the pH of a solution that is 0.15M C2HsNHsBr (ethyl ammonium bromide)? 16.76 A buffer is prepared by adding 115 mL of 0.30M NH3 to 135 mL of 0.15MNHANO3. What is the pH of the final solution? 16.84 How many moles of hydrofluoric acid, HF must be added to 250 mL of 0.25 M sodium fluoride to give a buffer of pH 3.50? Ignore the volume change due to the addition of hydrofluoric acid. 16,138 Calculate the pH of a solution made by mixing 0.62 L of 0.10M NH4Cl with 0.50L of 0.10M Na) H. KtNHs is 1.8x103

Explanation / Answer

16.34 )

a) equation :

HCO2H + H2O ----------------------->HCO2-   + H3O+

b)

HF + H2O --------------------> H3O+ + F-

c)

HN3 + H2O --------------------> N3-   + H3O+

d)

HOCN + H2O -----------------------> H3O+ + CNO-

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