Answer
$44.6\ mL$
Work Step by Step
Number of moles of the base:
$1.45\ g\div 40.00\ g/mol=0.0363\ mol$
From stoichiometry, that's the same number of moles of acid, so:
$0.00363\ mol\div 0.812\ M=$
$0.0446\ L=44.6\ mL$
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