Given:
(m/v)% = 0.90 %
Mass of NaCl = 45 mg = 0.045 g
Now use:
(m/v)% = mass of NaCl in g * 100 / volume in mL
0.90 = 0.045 * 100 / volume in mL
volume = 5.0 mL
Answer: 5.0 mL
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