Question #91c2b

1 Answer
Apr 22, 2017

Answer:

#19.0 mL#

Explanation:

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

#mols NaOH(aq) = Molarity * Liters#

#mols NaOH(aq) = 0.020 M * 0.1000L#

#mols NaOH(aq) = 0.002 mols#

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 #0.0190 L#, or:

#19.0 mL#