Determine the initial volume, in milliliters, required to prepare each of the fo

Question

Determine the initial volume, in milliliters, required to prepare each of the following:

A) 21.0 mL of a 0.250 MKNO3 solution from a 5.90 M KNO3 solution

B) 24.0 mL of 2.50 MH2SO4 solution using a 12.8 M H2SO4 solution

C) 0.700 L of a 1.50 MNH4Cl solution using a 11.0 M NH4Cl solution

Determine the initial volume, in milliliters, required to prepare each of the following:

A) 21.0 mL of a 0.250 MKNO3 solution from a 5.90 M KNO3 solution

B) 24.0 mL of 2.50 MH2SO4 solution using a 12.8 M H2SO4 solution

C) 0.700 L of a 1.50 MNH4Cl solution using a 11.0 M NH4Cl solution

Explanation / Answer

A)
use dilution formula
M1*V1 = M2*V2
1---> is for stock solution
2---> is for diluted solution

Given:
M1 = 5.9 M
M2 = 0.25 M
V2 = 21.0 mL

use:
M1*V1 = M2*V2
V1 = (M2 * V2) / M1
V1 = (0.25*21)/5.9
V1 = 0.890 mL
Answer: 0.890 mL

B)
use dilution formula
M1*V1 = M2*V2
1---> is for stock solution
2---> is for diluted solution

Given:
M1 = 12.8 M
M2 = 2.5 M
V2 = 24.0 mL

use:
M1*V1 = M2*V2
V1 = (M2 * V2) / M1
V1 = (2.5*24)/12.8
V1 = 4.69 mL
Answer: 4.69 mL

C)
use dilution formula
M1*V1 = M2*V2
1---> is for stock solution
2---> is for diluted solution

Given:
M1 = 11.0 M
M2 = 1.5 M
V2 = 700 mL

use:
M1*V1 = M2*V2
V1 = (M2 * V2) / M1
V1 = (1.5*700)/11
V1 = 95.5 mL
Answer: 95.5 mL

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