Engineering
Chemistry
Solution Stoichiometry
Question

The volume (in mL) of 0.5 M NaOH required for the complete reaction with 150 mL of 1.5M H3PO3 solution is

900

1150

1250

1350

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Solution

1.5 M         H3PO4         150 mL
H3PO3 + 2NaOH → Na2HPO3 + 2H2O
0.225        450
M=nNaOHV(l)⇒V=4500.5=900  mL