"The hardness of a water sample containing 10–3 M MgSO4 expressed as CaCO3 equivalents (in ppm) is ______. (molar mass of MgSO4 is 120.37 g/mol)"

"Equivalance of MgSO 4 = Equivalance of CaCO 3 \n $\\Rightarrow$ 10 -3 $\\times$ 2 = [CaCO 3 ] $\\times$ 2\n $\\Rightarrow$ [CaCO 3 ] = 10 -3 M = 10 -3 mol/lit\n = 10 -3 $\\times$ 100 g/lit\n = 100 mg/lit\n = 100 ppm"

Easy INTEGER +4 / -1 PYQ · JEE Mains 2020

The hardness of a water sample containing 10^–3 M MgSO₄ expressed as CaCO₃ equivalents (in ppm) is ______.
(molar mass of MgSO₄ is 120.37 g/mol)

Answer (integer) 100

Solution

Equivalance of MgSO4 = Equivalance of CaCO3 $\Rightarrow$ 10-3 $\times$ 2 = [CaCO3] $\times$ 2 $\Rightarrow$ [CaCO3] = 10-3 M = 10-3 mol/lit = 10-3 $\times$ 100 g/lit = 100 mg/lit = 100 ppm

About this question

Subject: Chemistry · Chapter: Some Basic Concepts of Chemistry · Topic: Mole Concept

This question is part of PrepWiser's free JEE Main question bank. 163 more solved questions on Some Basic Concepts of Chemistry are available — start with the harder ones if your accuracy is >70%.

The hardness of a water sample containing 10–3 M MgSO4 expressed as CaCO3 equivalents (in ppm) is ______. (molar mass of MgSO4 is 120.37 g/mol)

Solution

About this question

More Some Basic Concepts of Chemistry questions

Drill 25 more like these. Every day. Free.

The hardness of a water sample containing 10^–3 M MgSO₄ expressed as CaCO₃ equivalents (in ppm) is ______.
(molar mass of MgSO₄ is 120.37 g/mol)