Question

Q12) A student adds some metallic ash in water taken in a test tube. The
ash gets completely dissolved in water and the solution changes colour.
What should the student do next to test the chemical properties of the
product formed​

Answer 1

Answer:ANSWER

 Mg+O  

2

​  

→MgO

Magnesium     Oxygen                    Magnesium

                                                       oxide (ash)

MgO+H  

2

​  

O→Mg(OH)  

2

​  

 

 Magnesium   Water                         Magnesium

                                                          hydroxide

                                                            (X)

MgO+H  

2

​  

O→Mg(OH)  

2

​  

 

Magnesium           Water                       Magnesium

oxide                                                       hydroxide

                                                                 (X)

Mg(OH)_2 solution is basic in nature which turns red litmus blue and phenolphthalein pink.

Explanation:

Answer 2

Answer:

metallic ashes means that there is a formation of metal oxide taking place when metal is heated in presence of oxygen. Metal oxides are generally basic in nature. Thus, we should check the basicity using red litmus paper. Following is an example.

Explanation:

K+O2-->K2O (reaction with oxygen)

K2O+H2O-->2KOH

KOH is basic in nature.

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Hope this helps