Question

GIVING BRAINLIEST You have a stock solution of HNO3 with a concentration of 4.5 x 10-4 M. However, you need 275 ml of a 2.50 x 10-5 M solution. How much of the stock solution will you need
A.23.08 mL
B.9.09 mL
C.15.3 mL
D.9 mL
E.20.0 mL

Answer 1

Answer:

15.3 mL

Explanation:

Given data:

Concentration of stock solution = 4.5 ×10⁻⁴ M

Final volume = 275 mL

Final concentration = 2.50 × 10⁻⁵M

Volume of stock solution required = ?

Solution:

Formula:

C₁V₁  =  C₂V₂

C₁ = Concentration of stock solution

V₁  =  Volume of stock solution

C₂ = Final concentration

V₂ = Final volume

Now we will put the values in formula.

C₁V₁  =  C₂V₂

4.5 ×10⁻⁴ M  × V₁  =  2.50 × 10⁻⁵M  ×275 mL

V₁ = 2.50 × 10⁻⁵M  ×275 mL / 4.5 ×10⁻⁴ M

V₁ = 152.7 /10 mL

V₁ = 15.27 mL ≅ 15.3 mL