One litre hard water contains 12 mg Mg²⁺. Milli equivalents of washing soda

One Litre Hard Water Contains 12 Mg Mg Milli Equivalents Chemistry Question

One litre hard water contains 12 mg Mg²⁺. Milli equivalents of washing soda required to remove its hardness is

Options

(a) 1
(b) 12.16
(c) 1 x 10⁻³
(d) 12.16 x 10⁻³

Correct Answer:

1

Explanation:

Equivalent weight of Mg2+ = molecular weight/ charge on ion
= 24/2 =12
Equivalent weight of Na2CO3 = Molecular Weight/ total charge =106/2 = 53
Weight of Mg2+ = 12mg =12/1000 gm
Let assume that Net weight of Na2CO3 required = w2
no.of equivalents of Mg2+ = no. of equivalent of Na2CO3 required
12/1000 * 12 = w2/53
w2 = 53/1000 gm
so milli equivalent of Na2CO3 required = (w2/E2) x 1000 = 1

Related Questions:

  1. What is formed when nitrobenzene is reduced using zinc and alkali
  2. Among the following the paramagnetic one is
  3. Which of the following is an azo dye
  4. When 1 mol of gas is heated at constant volume,temperature is raised
  5. Nitrobenzene combines with hydrogen in the presence of platinum to yield

Question Type: Apply (15)
Difficulty Level: Easy (1008)
Topics: Basic Concepts of Chemistry (94)
Subject: Chemistry (2512)

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*