What observations would you make which would indicate when the following reactio

Question

What observations would you make which would indicate when the following reactions are essentially complete?

a) the dissolving of marble (calcium carbonate) in hydrochloric acid,

CaCo3      +       2HCl  --------------  CaCl2 +         CO2   +      H20

White                  Colorless               Colorless      Gas

Solid                   Solution                  Solution

b) The reaction of potassium oxalate with potassium permangante in acid solution,

5K2C2O4      +         2KMnO4--------------     8H2SO4 ----------------

Colorless                  Purple                             Colorless

Solution                    Solution                           Solution

                                                                                                2MNSO4   +     6K2SO4    +   10CO2 +   8H2O

                                                                                                Colorless          Colorless           Gas

                                                                                                 Solution            Solution

Explanation / Answer

Q1(a) Complete reaction of CaCO3 ;it would have completely reacted.

(b) No more evolution of CO2

Q2 (a) KMnO4 's purple colour disappears.

(b) CO2 evoltion stops.

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