Answer to Question #236358 in General Chemistry for Ewan

Question

1. In a biochemical assay, a chemist needs to add 2.93 g of glucose to a reaction mixture. Calculate the volume in mL of a 1.35M glucose solution she should use for the addition.

2. The concentrated sulfuric acid we use in the laboratory is 98.0 percent H₂SO₄ by mass. Calculate the molality and molarity of the acid solution. The density of the solution is 1.83g/mL

3. Calculate the pH if 0.30M Acetic Acid, with Ka = 1.8 x 10-5 is added to 0.20M Sodium Acetate.

 

4. On the laboratory shelf are 250mM solutions of both Acetic Acid and Sodium Hydroxide. How would you make a 100 ml solution of 25mM Acetate buffer of pH 5.50 using these stock solution?

 

Answer 1

Molar mass of glucose = 180.156

= 180.156/2.93

= 61.49ml