A 1 mL portion of the unknown is treated with 2 mL of 6 M NaOH, added a few drops at a time with shaking. Immediately thereafter, 10 drops of 3% hydrogen peroxide are added dropwise with shaking, and the test tube is then heated for a few minutes in a water bath until bubbling ceases. The resulting conglomerate is then centrifuged and the supernatant liquid is decanted off and saved. (Although you have not demonstrated these facts for yourself, Ca2+ will be precipitated as the hydroxide at this stage and K+ will remain in the decanted liquid.)At this stage of the experiment which elements could be found in the DECANTED LIQUID?