Normality

Tested in 2 real MPSC questions across 2 years (2021–2023). See it in context on the interactive Concept Graph →

Years it was asked

2023 2021

What you need to know first

Molarity definitionn-factor calculation

Real questions that test this

1.5M H₂SO₄ च्या 10 dm³ द्रावणापासून 1.0N H₂SO₄ चे द्रावण कसे बनवाल ? How is 1.0N H₂SO₄ solution is prepared from 10 dm³ of 1.5M H₂SO₄ solution ?

a)दिलेल्या द्रावणात 5 dm³ पाणी घालून / By adding 5 dm³ of water to it

b)दिलेल्या द्रावणात 294 ग्रॅम H₂SO₄ घालून / By adding 294 g of H₂SO₄ to it

c)दिलेल्या द्रावणात 20 dm³ पाणी घालून / By adding 20 dm³ of water to it&check; Correct

d)दिलेल्या द्रावणात 174 ग्रॅम H₂SO₄ घालून / By adding 174 g of H₂SO₄ to it

Normality (N) = Molarity (M) x n-factor. For H2SO4, n-factor is 2, so 1.5M H2SO4 is 3.0N. Using dilution formula N1V1 = N2V2 (3.0 x 10 = 1.0 x V2), the final volume V2 must be 30 dm³. Since we already have 10 dm³, we need to add 20 dm³ of water.

समुद्रपातळीवर असलेल्या प्रयोगशाळेत वापरण्यासाठी, वर्षाच्या कोणत्याही दिवशी खालीलपैकी सगळ्यात योग्य संहति एकक/एकके _________ हे/ही आहे/आहेत. On any day of the year, to use in laboratories at sea level the most correct concentration unit/s is/are _________.

1)फक्त ग्रॅमरेणुता / Only molarity

2)फक्त प्रसामान्यता / Only normality

3)फक्त मोललता / Only molality&check; Correct

4)वरील सर्व / All of the above

Molality is independent of temperature because it is expressed in terms of mass of solvent (kg), whereas molarity and normality depend on volume which varies with temperature.

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