If I added 50 mL of a 1.0 M HCIO2 solution to 50 mL of a 1.0 M NaOH
solution, what would the pH of the resulting solution be? *

pH=7

Explanation:

0.05 L*1.0M= 0.05 mol HClO2  and 0.05 mol NaOH      

HClO2 +     NaOH ---> NaClO2 + H2O

0.05 mol     0.05 mol

As we can see acid and base  react completely,  solution will be neutral, so pH =7

1. they vary with a higher number because boiling is way hotter than melting