Predict whether the equivalence point of each of the fol- lowing titrations is below, above, or at pH 7: (a) formic acid titrated with NaOH, (b) calcium hydroxide titrated with perchloric acid, (c) pyridine titrated with nitric acid.

5) What is the pH of a 0.250 M HF solution? The K, of HF is 3.5 X 104. (2.03) HF (aq) + H2O (1) H30* (aq) +F ° (aq)

4.1.3.15. How many grams of sodium acetate trihydrate (m. wt. 136) and how many ml of 1 M acetic acid solution are necessary for preparing 3 liter 0.2 M, pH6.4 acetate buffer? pk, = 4.7 4.1.3.16. 0.03 g-eq. [H*] is formed during an enzymatic reaction carried out in 0.2 M TrisHCI buffer (pH=7.8). Calculate the pH at the end of reaction (pK,= 8.1). Calculate the pH if water were used instead of the buffer! Why is necessary to use the buffer in this reaction?

A 250.00 mL solution of 0.00215 M AB4 is added to a 230.00 mL solution of 0.00380 M C3D2. What is pQsp for A3D4?   Answer:     (18.607)