3. The set up below was used to collect gas K, produced by the reaction between water and calcium metal. Gask Water calcium Metal (b) At the end of the experiment, the solution in the beaker was found to be a weak base. Explain why the solution is a weak base

Ca(s) + 2H2O(l) = Ca(OH) 2(aq) + 2H2(g)

The gas K collected is hydrogen gas.

The solution after the experiment is found to be weak base because Ca(OH)2 is sparingly soluble in water forming a weak base.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.