Chemistry · Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both)
What is the molarity of solution?
What is the molarity of \( 0.2 \mathrm{N} \mathrm{Na}_{2} \mathrm{CO}_{3} \) solution?
- A. \( 0.1 \mathrm{m} \)
- B. O M
- C. \( 0.4 \mathrm{M} \)
- D. 0.2 M
Step-by-step solution
Normality (N) is related to molarity (M) by the n-factor (number of equivalents per mole). For Na2CO3 in acid-base reactions, it reacts with 2 moles of H+ (n=2), so Normality = 2 × Molarity. Given 0.2 N, Molarity = 0.2 / 2 = 0.1 M. Option A states '0.1 m', which is interpreted as 0.1 M despite the typographical use of 'm'.
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