Molarity & Dilutions

Front

What is molarity?

Back

Molarity (M) is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per liter of solution.

Front

How do you calculate the number of grams needed to prepare a solution of a given molarity?

Back

To calculate grams needed: grams = molarity (M) × volume (L) × molar mass (g/mol).

Front

What is the formula for dilutions?

Back

The formula for dilutions is M1V1 = M2V2, where M1 and V1 are the molarity and volume of the initial solution, and M2 and V2 are the molarity and volume of the diluted solution.

Front

What is the molar mass of NaCl?

Back

The molar mass of NaCl (sodium chloride) is 58.5 g/mol.

Front

How do you find the concentration after dilution?

Back

To find the concentration after dilution, use the dilution formula: M2 = (M1V1) / V2.

Front

What is the molar mass of AgNO3?

Back

The molar mass of AgNO3 (silver nitrate) is 169.9 g/mol.

Front

If you have 0.500 M NaBr and add more water, how does the concentration change?

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The concentration decreases when more water is added, as the number of moles of solute remains constant while the volume increases.

Front

How do you convert mL to L for molarity calculations?

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To convert mL to L, divide the volume in mL by 1000 (1 L = 1000 mL).

Front

What is the molarity of a solution containing 186.55 g of sucrose in 250 mL of water?

Back

The molarity is 2.18 M.

Front

How many grams of solute are in 125.0 mL of 5.00 M NaCl?

Back

There are 36.6 g of NaCl in 125.0 mL of 5.00 M NaCl.