Hard Chemistry Chapter 01: Solutions Class 12 Level 6

2 मोल प्रति लीटर विलयन से 0.5 मोल प्रति लीटर के 500 मिलीलीटर विलयन बनाने के लिए मूल विलयन का कितना आयतन चाहिए?

What volume of 2 mol L-1 stock solution is needed to prepare 500 mL of 0.5 mol L-1 solution?

Explanation opens after your attempt
Correct Answer

C. 125 मिलीलीटर / 125 mL

Step 1

Concept

In dilution, old molarity × old volume = new molarity × new volume.

Step 2

Why this answer is correct

2 × old volume = 0.5 × 500. Old volume = 250 ÷ 2 = 125 mL.

Step 3

Exam Tip

A concentrated stock solution is required in smaller volume. चरण 1: पतलन में पुरानी मोलरता × पुराना आयतन = नयी मोलरता × नया आयतन। चरण 2: २ × पुराना आयतन = ०.५ × ५००। पुराना आयतन = २५० ÷ २ = १२५ मिलीलीटर। चरण 3: मूल विलयन अधिक सांद्र होता है, इसलिए उसका आयतन कम लगता है।

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