Equivalent mass and n-factor for acids, bases and salts

37 questions on Equivalent mass and n-factor for acids, bases and salts from the Equivalent Concept and Titration chapter: 8 NEET level, 15 JEE Main, 14 JEE Advanced. Each one opens with its answer and solution.

• What is the equivalent mass of H3PO4 (molar mass 98 g mol^-1) in the reaction H3PO4 + 2NaOH -> Na2HPO4 + 2H2O? NEET level
• The equivalent mass of Ca(OH)2 (molar mass 74 g mol^-1) when it is completely neutralised by HCl is: NEET level
• Equivalent mass of Na2CO3 (molar mass 106 g mol^-1) when it reacts completely with excess HCl to give CO2 is: NEET level
• The equivalent mass of Al(OH)3 (molar mass 78 g mol^-1) in its complete neutralisation by an acid is: NEET level
• 6.37 g of H3PO4 (molar mass 98 g mol^-1) is converted completely to Na2HPO4 by NaOH. Calculate the volume of 0.25 M NaOH required, in mL (nearest integer). JEE Main level
• In the reaction Al(OH)3 + 2HCl -> Al(OH)Cl2 + 2H2O, the equivalent mass of Al(OH)3 (molar mass 78 g mol^-1) is: JEE Main level
• 3.7 g of Ca(OH)2 (molar mass 74 g mol^-1) is dissolved in water to make 250 mL of solution. Its normality for complete neutralisation by an acid is: JEE Main level
• A sulfuric acid solution is 30% H2SO4 by mass and has density 1.22 g mL^-1 (molar mass of H2SO4 =98 g mol^-1). Its normality (for complete neutralisation) is cl... JEE Main level
• Select the correct statement(s) about n-factors in the stated acid-base reactions. JEE Main level
• For complete reaction with excess aqueous HCl, the equivalent mass equals half of the molar mass for which of the following? JEE Main level
• Na2CO3 (molar mass 106 g mol^-1) is titrated with HCl and the titration is stopped at the phenolphthalein end point, where only CO3^2- -> HCO3- has occurred. Th... JEE Main level
• 17.1 g of Al2(SO4)3 (molar mass 342 g mol^-1) is completely precipitated as BaSO4 by BaCl2 solution (treat BaCl2 as having n=2). Select the correct statement(s)... JEE Main level
• A 2.90 g mixture of NaOH and Ca(OH)2 (molar masses 40 and 74 g mol^-1) is exactly neutralised by 75.5 mL of 1.00 N HCl. Calculate the mass percentage of NaOH in... JEE Advanced level
• 2.10 g of the carbonate MCO3 of an unknown divalent metal M is exactly neutralised by 51.2 mL of 0.800 N HCl. Taking the equivalent mass of the carbonate ion as... JEE Advanced level
• An oleum sample is labelled 118%, meaning that 100 g of oleum yields 118 g of pure H2SO4 on adding the required amount of water. Calculate the volume of 1.00 N ... JEE Advanced level
• 100 mL of a solution contains 0.100 M H3PO4 and 0.0500 M NaH2PO4. What volume of 0.500 M NaOH converts all the phosphorus species completely to Na3PO4? Answer i... JEE Advanced level
• A water sample contains, per litre, 48.6 mg Ca(HCO3)2, 36.5 mg Mg(HCO3)2 and 20.4 mg MgSO4. Hardness is expressed as ppm CaCO3 (mg of CaCO3 per litre containing... JEE Advanced level
• Na2HPO4 (molar mass 142 g mol^-1) reacts with both acids and bases. Select the correct statement(s). JEE Advanced level
• 500 mL of a solution containing 3.70 g Ca(OH)2 (molar mass 74 g mol^-1) is mixed with 400 mL of 0.150 M H2SO4. Assume both are fully dissociated, volumes are ad... JEE Advanced level
• The equivalent mass of H3PO3 (molar mass 82 g/mol) when it is completely neutralised by NaOH is (it is a dibasic acid): NEET level
• Equivalent mass of Ca(OH)2 (molar mass 74 g/mol) when it is neutralised completely by an acid is: NEET level
• Na_2CO_3 (molar mass 106 g/mol) reacts with excess HCl to give CO2 and water. Its equivalent mass in this reaction is: NEET level
• H3PO4 (molar mass 98 g/mol) is neutralised by NaOH according to H3PO4 + 2NaOH -> Na2HPO4 + 2H2O. Its equivalent mass in this reaction is: NEET level
• The equivalent mass of Ba(OH)2.8H2O as a base (H = 1, O = 16, Ba = 137) is: JEE Main level
• How many equivalents are present in 14.3 g of Na2CO3.10H2O (molar mass 286 g/mol) when it is titrated with excess HCl to CO2? JEE Main level
• 4.9 g of H3PO4 (molar mass 98 g/mol) is dissolved in water to make 250 mL of solution. Its normality for the reaction H3PO4 + 2NaOH -> Na2HPO4 + 2H2O is: JEE Main level
• 0.630 g of a dibasic acid is exactly neutralised by 20.0 mL of 0.500 M NaOH. Calculate the molar mass of the acid in g/mol (nearest integer). JEE Main level
• A 2.50 g sample of impure NaOH (inert impurities, molar mass 40 g/mol) requires 45.0 mL of 1.00 N HCl for complete neutralisation. Find the percentage purity of... JEE Main level
• Choose the correct statements (atomic masses: H 1, C 12, O 16, Na 23, P 31; equivalents = moles x n-factor). JEE Main level
• For 0.1 mol of each substance reacting completely as stated with a suitable reagent, which statements about the number of equivalents are correct? JEE Main level
• A 500 mL solution contains 4.0 g NaOH (40 g/mol) and 3.7 g Ca(OH)2 (74 g/mol). What volume of 0.50 M H2SO4 is required to neutralise 50.0 mL of this solution co... JEE Advanced level
• Borax (Na2B4O7.10H2O, 382 g/mol) reacts with acid as B4O7^2- + 2H+ + 5H2O -> 4H3BO3. What volume of 0.500 M HCl is needed to react completely with 1.91 g of bor... JEE Advanced level
• 0.200 mol of H3PO4 is treated with 0.520 mol NaOH so that all the acid is converted into a mixture of Na2HPO4 and Na3PO4 with no NaOH left over. The mole ratio ... JEE Advanced level
• Oleum is labelled by the mass of H2SO4 obtainable when water is added: '118%' oleum gives 118 g of H2SO4 per 100 g of oleum. How many mL of 1.00 M NaOH are need... JEE Advanced level
• 150 mL of 0.20 M H2SO4 is mixed with 100 mL of 0.30 M NaOH and 100 mL of 0.10 M Ca(OH)2 (all strong, volumes additive, CaSO4 solubility ignored). Calculate the ... JEE Advanced level
• Select the correct statements (molar masses: H3PO4 98, Ca(OH)2 74 g/mol). JEE Advanced level
• A 200 mL solution contains 0.020 mol H2SO4 and 0.010 mol HCl. Which statements are correct? JEE Advanced level