The initial volume is 8.42 mL.
<h3>Calculation:</h3>
The dilution formula is used to solve the question.
The dilution formula is given as,
M₁V₁ = M₂V₂
M₁ = initial molarity
M₂ = final molarity
V₁ = initial volume
V₂ = final volume
Given,
M₁ = 0.121 M
M₂ = 0.102 M
V₂ = 10 mL
To find,
V₁ =?
Put the values in the equation,
M₁V₁ = M₂V₂
0.121 × V₁ = 0.102 × 10
V₁ = 8.42 mL
Hence, the initial volume is 8.42 mL.
Learn more about the dilution formula here:
brainly.com/question/17156790
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