25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ions, CO32– are respectively (Molar mass of Na2CO3 = 106 g mol–1)
Molarity = 25.3 × 1000 / 106 × 250 = 0.9457 ≈ 0.955 M
Na2CO3 in aqueous solution remains dissociated as Na2CO3 ⇌ 2Na+ + CO32–
Since, the molarity of Na2CO3 is 0.955 M, the molarity of CO32– is also 0.955 M and that of Na+ is 2 × 0.955 = 1.910 M
The number of atoms in 20 g of SO3 is approximately -
NextThe ratio of total number of electrons present in 48 g of O₃ to 24 g of O₂ is
The molarity of 20% (W/W) solution of sulphuric acid is 2.55 M. The density of the solution is
Easy5.85 g NaCl is dissolved in 1 L water. The total number of Na+ and Cl– ions in 1 mL of this solution
EasyWhen 60 g of salt is dissolved in 600 mL of water, the mass by volume percentage of salt in the solu
Easy8 g NaOH is dissolved in one litre of solution, its molarity is:
MediumGiven below are two statements: Statement I: 10 ppm means 10 g solute in 106 g solution. Statement I
EasyWhich of the following concentration term is temperature dependent?
Practice Chemistry Exams
Full-length mock tests with detailed analytics, rank, and percentile.
Browse Exams