Hard Chemistry Chapter 01: Solutions Class 12 Level 6

40 ग्राम सोडियम हाइड्रॉक्साइड को जल में घोलकर 2 लीटर विलयन बनाया गया। विलयन की मोलरता क्या होगी?

40 g sodium hydroxide is dissolved in water to make 2 L solution. What is the molarity of the solution?

Explanation opens after your attempt
Correct Answer

B. 0.50 मोल प्रति लीटर / 0.50 mol L-1

Step 1

Concept

Molarity = moles of solute ÷ volume of solution in litres.

Step 2

Why this answer is correct

Molar mass of sodium hydroxide is 40 g per mol, so moles = 40 ÷ 40 = 1. Molarity = 1 ÷ 2 = 0.50.

Step 3

Exam Tip

For molarity, use final solution volume in litres. चरण 1: मोलरता = विलेय के मोल ÷ विलयन का आयतन लीटर में। चरण 2: सोडियम हाइड्रॉक्साइड का मोलर द्रव्यमान ४० ग्राम प्रति मोल है, इसलिए मोल = ४० ÷ ४० = १। मोलरता = १ ÷ २ = ०.५०। चरण 3: मोलरता में अंतिम विलयन का आयतन लीटर में लेना चाहिए।

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