What is the percent (w/v) for a solution containing 100 g of NaCl made up to 500 mL with distilled water?

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Multiple Choice

What is the percent (w/v) for a solution containing 100 g of NaCl made up to 500 mL with distilled water?

Explanation:
Percent weight/volume expresses how many grams of solute are present in 100 milliliters of solution. With 100 g of NaCl dissolved in a final volume of 500 mL, the concentration is 100 g / 500 mL = 0.2 g/mL, which is 20 g per 100 mL. Therefore the percent w/v is 20%. For reference, if you had 25 g in 500 mL you’d have 5% w/v, if you had 145 g in 500 mL you’d have 29% w/v, and if you had 290 g in 500 mL you’d have 58% w/v.

Percent weight/volume expresses how many grams of solute are present in 100 milliliters of solution. With 100 g of NaCl dissolved in a final volume of 500 mL, the concentration is 100 g / 500 mL = 0.2 g/mL, which is 20 g per 100 mL. Therefore the percent w/v is 20%.

For reference, if you had 25 g in 500 mL you’d have 5% w/v, if you had 145 g in 500 mL you’d have 29% w/v, and if you had 290 g in 500 mL you’d have 58% w/v.

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