Concentration Expressions Flashcard

Front

What is the formula to convert ppm to percentage strength?

Back

To convert ppm to percentage strength, divide the ppm value by 10,000. For example, 225 ppm = 225 / 10,000 = 0.0225%.

Front

How do you calculate the dose of a medication from a w/v solution?

Back

To calculate the dose from a w/v solution, use the formula: Dose (mg) = Volume (mL) x Concentration (mg/mL). For example, for a 1:1000 solution, 0.5 mL = 0.5 x 1 = 0.5 mg.

Front

What is the definition of a 2% solution?

Back

A 2% solution means there are 2 grams of solute in 100 mL of solution.

Front

How do you calculate the amount of solute needed for a specific volume of a solution?

Back

Use the formula: Amount of solute (g) = Desired concentration (%) x Volume (mL) / 100. For a 2% solution in 3500 mL, it would be 2 x 3500 / 100 = 70 grams.

Front

What does w/v stand for in solution concentration?

Back

w/v stands for weight/volume, indicating the mass of solute in a given volume of solution, typically expressed in grams per 100 mL.

Front

How do you calculate the percentage strength of a solution from its components?

Back

Percentage strength can be calculated using the formula: % Strength = (Amount of solute (g) / Total volume of solution (mL)) x 100.

Front

What is the significance of using µL in solution preparation?

Back

µL (microliter) is a unit of volume used for very small quantities, often in laboratory settings for precise measurements.

Front

How do you convert a percentage concentration to mg/mL?

Back

To convert a percentage concentration to mg/mL, multiply the percentage by 10. For example, 0.01% = 0.01 x 10 = 0.1 mg/mL.

Front

What is the relationship between volume and concentration in medication dosing?

Back

The relationship is direct; as the volume of the solution increases, the total amount of medication administered also increases, assuming concentration remains constant.

Front

How do you express a 35% w/v solution in mg/mL?

Back

A 35% w/v solution means there are 35 grams of solute in 100 mL of solution, which is equivalent to 350 mg/mL.