1.The value for is 7.46. Would a buffer prepared from and with a pH of 6.96 be c

ID: 1044925 • Letter: 1

Question

1.The value for is 7.46. Would a buffer prepared from and with a pH of 6.96 be considered to be an effective buffer? a. yes b. no

A buffer in which the mole ratio of to is 0.60 has a pH of 7.24. Would this buffer solution have a greater capacity for?

a. added acid b. added base

2.A buffer solution that is 0.376 M in and 0.376 M in has a pH of 4.74.

The addition of 0.01 mol of to 1.0 L of this buffer would cause the pH to=

a. increase slightly b.increase by 2 units c. decrease slightlyd. decrease by 2 units e. not change.

The capacity of this buffer for added could be increased by the addition of 0.150 mol=

a. of the weak acid b. of the salt.

The value for is 7.46. Would a buffer prepared from and with a pH of 6.96 be considered to be an effective buffer?

Answer = a. yes, it is an effective buffer.

A buffer in which the mole ratio of to is 0.60 has a pH of 7.24. Would this buffer solution have a greater capacity for?

a. added acid, it is an acidic buffer.

2. pH = pka + log(salt/acid)

4.74 = pKa + log(0.376/0.376)

pka = 4.74

by the addition of 0.01 moles of 1.0 L to buffer.

pH = 4.74 + log(0.366/0.386)

= 4.71

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