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.
