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A laboratory technician needs to prepare 500 milliliters of a 2 M solution of sodium hydroxide (NaOH) in a flask. The flask has a volume of exactly 500 milliliters. Which quantity does the laboratory technician need to measure before making the solution?

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Answer:

40 g NaOH

Step-by-step explanation:x

To make 500 mL of a 2 mol·L⁻¹ solution, the technician must measure the correct mass of NaOH.

Step 1. Calculate the moles of NaOH

c = n/V     Multiply both sides by V

n = Vc

c = 2 mol·L⁻¹

V =0.5 L

n = 0.5 × 2

n = 1 mol NaOH

Step 2. Calculate the mass of NaOH

The molar mass of NaOH is 40.00 g/mol.

m = 1 × 40.00/1

m = 40 g NaOH

The technician must measure 40 g of NaOH.

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