Calculate the final concentration of the solution when water is added to prepare each of the following solutions.
65.0 mL of a 22.0 M HCl solution is diluted to 520. mL
50.0 mL of a 21.0 %(m/v) NH4Cl solution is diluted to 175 mL
5.00 mL of a 9.50 M KOH solution is diluted to 90.0 mL
1)
use dilution formula
M1*V1 = M2*V2
1---> is for stock solution
2---> is for diluted solution
Given:
M1 = 22 M
V1 = 65 mL
V2 = 520 mL
use:
M1*V1 = M2*V2
M2 = (M1*V1)/V2
M2 = (22*65)/520
M2 = 2.75 M
Answer: 2.75 M
2)
Given:
M1 = 21 %
V1 = 50 mL
V2 = 175 mL
use:
M1*V1 = M2*V2
M2 = (M1*V1)/V2
M2 = (21*50)/175
M2 = 6.00 %
Answer: 6.00 %
3)
Given:
M1 = 9.5 M
V1 = 5 mL
V2 = 90 mL
use:
M1*V1 = M2*V2
M2 = (M1*V1)/V2
M2 = (9.5*5)/90
M2 = 0.5278 M
Answer: 0.528 M
Calculate the final concentration of the solution when water is added to prepare each of the...
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