Mn or Co is treated with 1 mL of 6 M HNO3 followed immediately by the drop-wise addition of 3% hydrogen peroxide until the preci

Question

3 years ago

5

Mn or Co is treated with 1 mL of 6 M HNO3 followed immediately by the drop-wise addition of 3% hydrogen peroxide until the preci

pitate fully dissolves. The test tube is then heated in a water bath until bubbling ceases. At this stage of the experiment, which elements could be found in the resulting LIQUID?

Chemistry

1 answer:

ki77a [65] · Answer 1 · 2021-12-31T01:53:27+03:00

Answer:

Mn, Co, H, N and O

Explanation:

When metallic Mn or Co reacts with concentrated HNO₃, they dissolve completely in the acid . The products formed are the nitrates of the metals, water and a mixture of NO and NO₂ gases. Hydrogen peroxide is added to oxidize any NO to NO₂ which is less harmful.

The equations of the reaction are given below;

Mn + HNO₃ ====> Mn(NO₃)₂ + NO + H₂O

Co + HNO₃ ====> Co(NO₃)₂ + NO + H₂O

H₂O₂ + NO ====> H₂O + NO₂

The resulting solution will be the soluble nitrates of manganese and cobalt as well water and this solution contains the following elements; Mn, Co, N, H And O.