A 35.0 mL sample of HCl solution is placed in a flask, with a few drops of phenolphthalein indicator. Of 45.9 mL of a 0.200 M solution is required to reach the endpoint, what was the concentration of the HCl solution
we know that
at endpoint
moles of acid = moles of base
also
moles = molarity x volume
so
at end point
Ma x Va = Mb x Vb
given
Va = 35
Mb = 0.2
Vb = 45.9
so
Ma x 35 = 0.2 x 45.9
Ma = 0.2623
here acid is HCl
so
the concentration of the HCl solution is0.2623 M
A 35.0 mL sample of HCl solution is placed in a flask, with a few drops...
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