Question

A.) Describe step by step, how will you prepare 10mL of 0.020 M HCl from the 0.050 M solution?

5.) How will you prepare the following solutions from 6.0 M solutions of acetic acid and ammonia? Give exact details. Assume that a 100 mL graduated cylinder are available.

a.) 80ml of 0.10 MHC2H3O2

b.) 80 mL of 0.10 MNH3

Answer 1

A.) Describe step by step, how will you prepare 10mL of 0.020 M HCl from the 0.050 M solution?

M1 = 0.05

V1 = ?

V2 = 10 ml

M2 = 0.02

Apply dilution law

M1*V1 = M2V2

V1 = M2/M1*V2 = 0.02*10/0.5 = 0.4 ml

Steps:

add 0.4 ml of the M = 0.05 solution.

Then, in the flask, add water until V = 10 ml

this will let th solution in M= 0.02 M

5.) How will you prepare the following solutions from 6.0 M solutions of acetic acid and ammonia? Give exact details. Assume that a 100 mL graduated cylinder are available.

M = 6

a) V = 80 ml ofM = 0.1 HAc

M1*V1 = M2*V2

V1 = M1*V2/V1 = 0.1*80/6 = 1.3333 ml

Steps:

in the 100 ml cylindr, measure 1.333 ml of actic acid (concnetrated).

After this, add water until mark stays in 80 ml . This will b your final solution at 0.1 M}

b)

Same case of 0.1 M of NH3

Add 1.66 ml of solution 6M of NH3 solution

Add water until volume states 80 ml. Then you got your final solution