A stock solution of hydrochloric acid with 1.25 M, 25 mL was diluted to 75 mL with water. What was the new concentration of this diluted acid?

1 Answer
Dr. K.
Jun 21, 2018

0.42 M

Explanation:

To calculate the new concentration, we'll use the dilution formula

#M_1##V_1# = #M_2##V_2#

#M_1# = Concentration of stock solution = 1.25 M
#M_2# = Concentration of diluted solution = ?
#V_1# = Volume of stock solution = 25 mL
#V_2# = Volume of diluted solution = 75 mL

#M_1##V_1# = #M_2##V_2#
#1.25# x #25# = #M_2# x #75#
#M_2# = #0.42 "M"#

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