Question #91c2b

1 Answer
Apr 22, 2017

19.0mL

Explanation:

First, find the moles of NaOH(aq) needed to create the 100.0 mL of 0.020 M NaOH(aq) solution.

molsNaOH(aq)=MolarityLiters

molsNaOH(aq)=0.020M0.1000L

molsNaOH(aq)=0.002mols

Now that you know how many moles you need, find many mL of 0.105 M NaOH(aq) solution is needed in order to have 0.002 moles.

Liters=moles NaOH(aq)Molarity

Liters=0.002 moles NaOH(aq)0.105 M NaOH(aq)

Liters=0.0190476

Since you have 3 significant figures the answer would be 0.0190L, or:

19.0mL