# 6.8: Unit 6 Practice Problems

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### Question 1.

In a solution, the substance being dissolved is called the _____________.

solute

In a solution, the substance that does the dissolving is called the _____________.

solvent

### Question 2.

If 3.0g of Na2SOis dissolved in 450mL of water.  What is the concentration of the resulting solution in g/L, g/dL, % w/v, mg/dL, mg%, M and mM.

### Question 3.

What is the % by volume concentration of a solution of acid which contains 56mL HCl dissolved in 0.70L of distilled water?

### Question 4.

A patient needs to be injected with 5.0mg of a drug.  The drug is in a solution with a concentration of 2.0mg/mL.  How many mL of this medication should be given to the patient?

### Question 5.

If you have 41 mL of 0.36M KCl and you add 150mL of distilled water to the solution, what is the concentration in mM of the diluted KCl solution?

### Question 6.

If 86 mL of 5.0% w/v NaCl solution is diluted to 1.1L what is the concentration of the resulting solution in %w/v and mg/dL?

### Question 7.

How many mL of a 8.0g/dL NaOH solution would be needed to provide a total of 36g of NaOH.

### Question 8.

Predict whether N2 will be more soluble in water (a polar substance) or gasoline (a nonpolar substance).

N2 will be more soluble in gasoline because N2 is also nonpolar (like dissolves like)

If ascorbic acid is soluble in water, would you expect it to be soluble in fat (a nonpolar substance)?

Since ascorbic acid is soluble in water, it is reasonable to assume that it is polar (or ionic) making it insoluble in fat.

### Question 9.

What is the concentration in ppm if 0.0130 grams MgCl2 is dissolved in 1.20L of water?