Question

What is the PH of a solution prepared by dissolving .832 g of NaOH in 6.5 L of water?

A. 2.5
B. 12.3
C. 1.68
D. 7
E. 11.5

Answer 1

Steps:
1. Calculate the moles of NaOH. The molar mass of NaCl is 58.443 g/mol.
2. Calculate the concentration of NaOH, which will be the same concentration of OH-.
3. Take the negative log (based 10) of the OH- concentration to get pOH.
4. Subtract the pOH from 14 to get pH.