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

⇦

⇨

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. Which of the following possible isomers of butanol has a chiral centre
2. Which of the following is not correct regarding terylene
3. A hydrocarbon contains 20% hydrogen and 80% carbon.The empirical formula is
4. The correct order of stability of the superoxides is
5. The maximum number of electrons in a subshell is given by the expression

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.

---

Share this page with your friends