Here are my questions from chemistry 102 I need help in them please help me. Asp

Question

Here are my questions from chemistry 102 I need help in them please help me. Aspirin Pre-Lab - Week 2 Week 2 Objectives Determine % yield from synthesis Determination of melting point Iron Ill chloride test Determining amount of contaminating salicylic acid Remember to refer to the project outline for helpful hints. 1. Write an equation for how you will calculate the percent yield for your synthesis reaction. 2. What is the melting point of acetylsalicylic acid? 3. Outline how you will prepare 5 standard solutions ranging in concentration from 1 x 10 to 1 x 10 M salicylic acid from a 2.5 x 10 M stock solution Plan to prepare 25 mL of each solution. Look at the project outline to determine the other components of these solutions

Explanation / Answer

1. Percent yield = (experimental yield/theoretical yield) * 100

2. 136 oC

3. Volume of stock solution (2.5 x 10-3 M) required to prepare 25 ml of 1 x 10-3 M salicylic acid

= (Molarity of salicylic acid (standard solution-1) x volume of salicylic acid)/Molarity of stock solution

= (1*10-3 x 25)/2.5*10-3

   = 10 ml

Standard solution-2 (0.8 x 10-3 M)

Volume of stock solution (2.5 x 10-3 M) required to prepare 25 ml of 0.8 x 10-3 M salicylic acid

= (0.8*10-3 x 25)/2.5*10-3

= 8 ml

Standard solution-3 (0.6 x 10-3 M)

Volume of stock solution (2.5 x 10-3 M) required to prepare 25 ml of 0.6 x 10-3 M salicylic acid

= (0.6*10-3 x 25)/2.5*10-3

= 6 ml

Standard solution-4 (0.4 x 10-3 M)

Volume of stock solution (2.5 x 10-3 M) required to prepare 25 ml of 0.4 x 10-3 M salicylic acid

= (0.4*10-3 x 25)/2.5*10-3

= 4 ml

Standard solution-5 (1.0 x 10-4 M)

Volume of stock solution (2.5 x 10-3 M) required to prepare 25 ml of 1.0 x 10-4 M salicylic acid

= (1.0*10-4 x 25)/2.5*10-3

= 1 ml

Above calculated volumes are make up to 25 ml each to prepare standard solutions

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