What is the effect of substituting soluble metal salts such as nacl and k2co3 for hcl or (nh4)2co3 in the qualitative analysis scheme for separating the five analytical groups?
a. na+ and k+ react violently with acids such as h2s, producing highly flammable and potentially explosive hydrogen gas.
b. there is no effect on the analysis since na+ and k+ do not form a precipitate.
c. potassium ion forms a precipitate with sulfide ion.
d. you can no longer tell if your original sample contained na+ or k+.
e. the nacl and k2co3 are not pure, analytical grade materials.

D. You can no longer tell if your original sample contained Na+ or K+.

Explanation:

Group reagents are the reagents which are used to separate a whole group of cations from the other groups of cations.

For example, for group 1 , the group reagent is HCl and for group 5, the group reagent is ammonium carbonate.

When sodium chloride and potassium carbonate is used, it means we are contaminating our sample with foreign cations which may interfere in the process of detection. Also, we will not be able to decipher whether the sample has these ions in the initial or not as we have added them.

is there multiple choice answers?

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.