Get premium membership and access questions with answers, video lessons as well as revision papers.

Describe the Qualitative analysis for cations using sodium hydroxide solution.

      

Describe the Qualitative analysis for cations using sodium hydroxide solution.

  

Answers


Kavungya
(i). Procedure:
- To about 2cm3 of solutions containing ions of calcium, magnesium, aluminium, zinc, iron, lead, copper etc in separate test tubes; aqueous sodium hydroxide is added dropwise till in excess.

(ii). Observations:
The various metal ions reacted as summarized in the table below.
fig53042019103.png

(iii). Explanations:
- Most metal ions in solution react with sodium hydroxide solution to form insoluble metal hydroxides.
- In excess sodium hydroxide, some of the so formed hydroxides (hydroxides of Zn, Al, Pb and Cu) dissolve forming complex ions.

fig53042019110.png
Kavungya answered the question on April 30, 2019 at 10:11


Next: Describe the reactions of cations with common laboratory reagents and solubilities of some salts in water.
Previous: Explain the reaction of ammonia with air in the presence of platinum wire.

View More Chemistry Questions and Answers | Return to Questions Index


Learn High School English on YouTube

Related Questions