Question

1. Prepare a stock solution: Weigh 5 grams of sucrose and dissolve it in 50 mL of water. What is the concentration (% w/v) of sucrose in this solution? C% = (5g / 50ml) * 100 = 10% C% = (m_sucrose * 100) / V = (5 * 100) / 50 2. Make 20 mL of a 2.5% (w/v) solution of sucrose using the stock solution prepared in step 1. How many mL of stock do you need? How much water do you need? Show your calculations. C1 V1 = C2 V2 20 * 2.5 = 10 * V2 => V2 = 5 mL

          1. Prepare a stock solution: Weigh 5 grams of sucrose and dissolve it in 50 mL of water. What is the concentration (% w/v) of sucrose in this solution?
C% = (5g / 50ml) * 100 = 10% 
C% = (m_sucrose * 100) / V = (5 * 100) / 50
2. Make 20 mL of a 2.5% (w/v) solution of sucrose using the stock solution prepared in step 1. How many mL of stock do you need? How much water do you need? Show your calculations.
C1 V1 = C2 V2
20 * 2.5 = 10 * V2 => V2 = 5 mL

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1. Prepare a stock solution: Weigh 5 grams of sucrose and dissolve it in 50 mL of water. What is the concentration (% w/v) of sucrose in this solution?
C% = (5g / 50ml) * 100 = 10%
C% = (msucrose * 100) / V = (5 * 100) / 50
2. Make 20 mL of a 2.5% (w/v) solution of sucrose using the stock solution prepared in step 1. How many mL of stock do you need? How much water do you need? Show your calculations.
C1 V1 = C2 V2
20 * 2.5 = 10 * V2 => V2 = 5 mL

Added by Vivian D.

Chemistry The Molecular Science

John W. Moore, Conrad L. Stanitski 5th Edition

Chapter 13

Instant Answer

Solved by Expert Ma Ednelyn Lim

01/26/2024

Step 1

5% solution. We can use the formula \( c_{1} v_{1}=c_{2} v_{2} \), where \( c_{1} \) is the concentration of the stock solution, \( v_{1} \) is the volume of the stock solution we need, \( c_{2} \) is the concentration of the final solution, and \( v_{2} \) is the Show more…

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