A buffer solution that is 0.403 M in HF and 0.403 M in NaF has a pH of 3.14 . (1
ID: 500851 • Letter: A
Question
A buffer solution that is 0.403 M in HF and 0.403 M in NaF has a pH of 3.14.
(1) The addition of 0.01 mol of H3O+ to 1.0 L of this buffer would cause the pH to _________increase slightly increase by 2 units decrease slightly decrease by 2 units not change.
(2) The capacity of this buffer for added H3O+could be increased by the addition of 0.148 mol_________of the weak acid of the salt.
Consider these compounds:
Complete the following statements by entering the letter corresponding to the correct compound.
Without doing any calculations it is possible to determine that zinc phosphate is more soluble than , and zinc phosphate is less soluble than .
It is not possible to determine whether zinc phosphate is more or less soluble than by simply comparing Ksp values.
Please show your work and be specific, I have asked these questions already and got the wrong answers because they weren't answered fully!
A. CaCrO4 B. Fe2S3 C. CaCO3 D. Ca3(PO4)2Explanation / Answer
Buffer of HF/NaF
(a) addition of 0.01 mol H3O+ to 1 L of buffer
pH = pKa + log(base/acid)
= 3.14 + log[(0.403 M x 1 L - 0.01 mol)/(0.403 M x 1 L + 0.01 mol)]
= 3.12
Causes the pH to decrease slightly from 3.14 to 3.12.
(2) The capacity of this buffer for added H3O+ could be increased by the addition of 0.01 mol of the salt of weak acid.
For the given salts,
lower Ksp means lower solubility, higher Ksp means greater solubility.
Without doing any calculations it is possible to determine that zinc phosphate is more soluble than D., and zinc phosphate is less soluble than A, B and C.
It is possible to determine whether zinc phosphate is more or less soluble than by simply comparing Ksp values.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.