When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The molarity of the remaining nitric acid solution is \(x × 10^{–2} M\). (Nearest integer)
(Molar mass of nitric acid is 63 g mol–1)
(Molar mass of nitric acid is 63 g mol–1)
Correct Answer: 54
Solution and Explanation
m moles of \(HNO_3=800×0.5\)
Moles of \(HNO_3=400×10^{−3}=0.4\) moles
Weight of \(HNO_3 = 0.4 × 63 g= 25.2\) g
Remaining acid \(= 25.2 – 11.5= 13.7\) g
\(M=\frac {13.7×1000}{400×63}\)
\(M=\frac {137}{252}\)
\(M=0.54\)
\(M=54×10^{−2}\)
Given that, The molarity of the remaining nitric acid solution is \(x×10^{−2} M\).
On comparing, \(x= 54\)
So, the answer is \(54\).
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Concepts Used:
Some Basic Concepts of Chemistry
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.
- Chemistry is a core branch of science that explains us about the various compositional properties and interaction of matter. It also helps to understand various chemical reactions.
- Chemistry is important in order to understand the behaviour of fertilizers, alkenes, acids, salts, dyes, polymers, drugs, soaps and alloys in organic and inorganic chemistry.
- Chemistry plays an important role in various fields like healthcare, industrial, research, food, and farm activities.
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Classification of Matter
There are two ways of classifying the matter:
(A) Physical Classification:
Matter can exist in three physical states:
- Solids - have definite volume and definite shape
- Liquids - have definite volume but not definite shape.
- Gases - have neither definite volume nor definite shape.
(B) Chemical Classification:
Based upon the composition, matter can be divided into two main types:
- Pure Substances are defined as a single substance (or matter) which cannot be separated by simple physical methods. Pure substances can be further classified as (i) Elements (ii) Compounds
- Mixtures are the combination of two or more elements or compounds which are not chemically combined together and may also be present in any proportion.