Which of the following is a Lewis acid? nh_4^+ nh_3 HCI BF_3 How will the pH of

Question

Which of the following is a Lewis acid? nh_4^+ nh_3 HCI BF_3 How will the pH of a 0.500 M HOC_6H_5 solution change if 0.50 mol of NaOC_6H_5 to 3.00 L the solution? The pH of the solution stays the same The pH of the solution increases The pH of the solution decreases We need to know the K_a of HOC_6H_5 to make a statement about the pH. H_2C_6H_5O_7 can act as either an acid or a base in a water solution. What is the conjugate acid and conjugate base, respectively, of the H_2C_6HsO_7 ion? A weak acid, HF, is in solution with dissolved sodium fluoride, NaF. if HCl is added, which ion will react with the extra hydrogen ions from the HCl to keep the pH from changing? OH_-Na^+ F^- Na^-

Explanation / Answer

1)Ans) d

Lewis acids are electron pair acceptor so BF3 is the answer

2)Ans) d

phenol is a weak acid so Ka is needed to know the changes in PH

3)Ans) a

A pair of acid and base which differ by a proton is known as conjugate pair of acid and base

H2C6H5O7- its conjugate acid H3C6H5O7

H2C6H5O7- its conjugate base HC6H5O7-2

4)Ans) c

The anion (F-) of salt (NaF) consumes H+ given by acid (HCl)

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