A 25ml aliquot of an HCl solution of unknown concentration is pipetted into a 125ml Erlenmeyer flask.3
The moles of solute does not change in a dilution.
M= mol solute / volume solution
M1 * V1 = M2 * V2
M1 = M2 * (V2 / V1) = M2 * (0.125/0.025)
M1 = 5 M2
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