1. If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the mo
ID: 588709 • Letter: 1
Question
1. If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be? 2. If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 ml, what will the molarity of the diluted solution be? 3. How much 0.05 M HCI solution can be made by diluting 250 mL of 10 M HC1? 4. I have 345 mL of a 1.5 M NaCI solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be? How much water would I need to add to 500 mL of a 2.4 M KCI solution to make a 1.0 M solution? 5.Explanation / Answer
1)
use dilution formula
M1*V1 = M2*V2
Here:
M1 is molarity of solution before dilution
M2 is molarity of solution after dilution
V1 is volume of solution before dilution
V2 is volume of solution after dilution
we have:
M1 = 0.15 M
V1 = 125 mL
V2 = 125 mL + 25 mL = 150 mL
we have below equation to be used:
M1*V1 = M2*V2
M2 = (M1*V1)/V2
M2 = (0.15*125)/150
M2 = 0.125 M
Answer: 0.125 M
2)
we have:
M1 = 0.15 M
V1 = 100 mL
V2 = 150 mL
we have below equation to be used:
M1*V1 = M2*V2
M2 = (M1*V1)/V2
M2 = (0.15*100)/150
M2 = 0.100 M
Answer: 0.100 M
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