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Chemistry
Some Basic Concepts of Chemistry Mass and Stoichiometry
Chemistry > Chapter: Some Basic Concepts of Chemistry > Mass and Stoichiometry
Chapter: Some Basic Concepts of Chemistry
Mass and Stoichiometry
Question 1 2.5 moles of sulphuryl chloride were dissolved in water to produce sulphuric acid and hydrochloric acid. How many moles of KOH will be required to completely neutralize the solution? Ans.
SO 2Cl2 + 2H2O H2SO 4 + 2HCl
Mol of HCl produced from 2.5 moles of SO2 Cl2 = 5 mol Mol of H2SO 4 produced from 2.5 moles of SO2Cl2 = 2.5 mol H2SO4 + 2KOH HCl + KOH K2SO 4 + 2H2O; KCl + H2 O
Now, 5 mol of H2SO 4 require KOH = 2.5 mol Total KOH required = 10 + 2.5 = 12.5 mol.
Question 2 Two acids H2SO4 and H3PO4 are neutralized separately by the same amount of an alkali when sulphate and dihydrogen orthophosphate are formed respectively. Find the ratio of masses of H2SO4 and H3PO4 [at mass P = 31] Ans.
H2SO4 + 2NaOH Na 2SO4 + 2H2O H3PO4 + NaOH NaH2PO4 + H2O Equivalent of alkali = 1 g equivalent of H2SO4 = 1 g equivalent
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Chemistry
Some Basic Concepts of Chemistry Mass and Stoichiometry
Chemistry > Chapter: Some Basic Concepts of Chemistry > Mass and Stoichiometry
Chapter: Some Basic Concepts of Chemistry
Mass and Stoichiometry
Question 1 2.5 moles of sulphuryl chloride were dissolved in water to produce sulphuric acid and hydrochloric acid. How many moles of KOH will be required to completely neutralize the solution? Ans.
SO 2Cl2 + 2H2O H2SO 4 + 2HCl
Mol of HCl produced from 2.5 moles of SO2 Cl2 = 5 mol Mol of H2SO 4 produced from 2.5 moles of SO2Cl2 = 2.5 mol H2SO4 + 2KOH HCl + KOH K2SO 4 + 2H2O; KCl + H2 O
Now, 5 mol of H2SO 4 require KOH = 2.5 mol Total KOH required = 10 + 2.5 = 12.5 mol.
Question 2 Two acids H2SO4 and H3PO4 are neutralized separately by the same amount of an alkali when sulphate and dihydrogen orthophosphate are formed respectively. Find the ratio of masses of H2SO4 and H3PO4 [at mass P = 31] Ans.
H2SO4 + 2NaOH Na 2SO4 + 2H2O H3PO4 + NaOH NaH2PO4 + H2O Equivalent of alkali = 1 g equivalent of H2SO4 = 1 g equivalent