Question:

25.3g25.3 \, g of sodium carbonate, Na2CO3Na_2CO_3 is dissolved in enough water to make 250mL250 \, mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+Na^+ and carbonate ions,CO32CO^{2-}_3 are respectively (Molar mass of Na2CO3=106gmol1Na_2CO_3 = 106 \, g \, mol^{-1})

Updated On: May 19, 2024
  • 0.477 M and 0.477 M
  • 0.955 M and 1.910 M
  • 1.910 M and 0.955 M
  • 1.90 M and 1.910 M
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The Correct Option is C

Approach Solution - 1

Molarity = 25.3×1000106×250=0.955M\frac{25.3 \times 1000}{106 \times 250} = 0.955 \, M
Na2CO3>2Na++CO32{ Na_2 CO_3 -> 2Na^+ + CO^{-2}_3}
=2×0.955  0.955M = 2 \times 0.955 \, \, 0.955 \, M
=1.910M = 1.910 \, M
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Approach Solution -2

Ans: Molar concentration and molarity are interchangeable. It is the amount of solute in the given volume of solvent. The concentration of the solute in the solution can be expressed as molar concentration. It is the number of moles of solute per litre of solution (mol/L). The unit of molarity is called molar (M), it is the one mole of the solute that is per litre of the solution. 

The formula for the same is: C=n/V 

In this, C= molar concentration in mol//L (M)

n=Amount of solute in moles (mol) 

V=Volume of solution in litres (L) 

The molarity is used in the following: 

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Chemistry is a vast subject and for understanding its significance we can take help of following points:

  • Chemistry plays an important role in understanding various subjects like physics, geology and biology.
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There are two ways of classifying the matter:

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Matter can exist in three physical states:

  1. Solids - have definite volume and definite shape
  2. Liquids - have definite volume but not definite shape.
  3. Gases - have neither definite volume nor definite shape.

(B) Chemical Classification:

Based upon the composition, matter can be divided into two main types:

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