Answer
$42.5\ mL$
Work Step by Step
Number of moles of the salt:
$2.152\ g\div 105.99\ g/mol=0.02030\ mol$
From stoichiometry:
$0.04061\ mol$ of acid.
Volume:
$0.04061\ mol\div 0.955\ M=0.0425\ L=42.5\ mL$
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