Question

12. a. What is the molarity of a solution made by mixing 125 mL of 5.00 M H,PO with 325 mL H30? b. What is the molarity of a solution make by mixing 75 mL of 0.25 M Na SO. with 150 mL H:07 c. What volume of 9.00 M HNO, is needed to make 675 ml of 0.750 M HNO,? d. What volume of 15.0 M H,PO4 is needed to make 750.0 mL of 3.0 MH,PO ? 13. A group of shipwreck survivors floated for several days on a life raft before being rescued. Those who had drunk some seawater were found to be suffering the most from dehydration. Explain.

Answer 1

a)

use dilution formula

M1*V1 = M2*V2

1---> is for stock solution

2---> is for diluted solution

Given:

M1 = 5 M

V1 = 125 mL

V2 = 125 mL + 325 mL = 450 mL

use:

M1*V1 = M2*V2

M2 = (M1*V1)/V2

M2 = (5*125)/450

M2 = 1.39 M

Answer: 1.39 M

b)

use dilution formula

M1*V1 = M2*V2

1---> is for stock solution

2---> is for diluted solution

Given:

M1 = 0.25 M

V1 = 75 mL

V2 = 75 mL + 150 mL = 225 mL

use:

M1*V1 = M2*V2

M2 = (M1*V1)/V2

M2 = (0.25*75)/225

M2 = 0.0833 M

Answer: 0.0833 M

c)

use dilution formula

M1*V1 = M2*V2

1---> is for stock solution

2---> is for diluted solution

Given:

M1 = 9 M

M2 = 0.75 M

V2 = 675 mL

use:

M1*V1 = M2*V2

V1 = (M2 * V2) / M1

V1 = (0.75*675)/9

V1 = 56.25 mL

Answer: 56.3 mL

d)

use dilution formula

M1*V1 = M2*V2

1---> is for stock solution

2---> is for diluted solution

Given:

M1 = 15 M

M2 = 3 M

V2 = 750 mL

use:

M1*V1 = M2*V2

V1 = (M2 * V2) / M1

V1 = (3*750)/15

V1 = 150 mL

Answer: 150 mL

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