MyQuestionIcon

4

You visited us 4 times! Enjoying our articles? Unlock Full Access!

Preparation of Soap Using Caustic Soda

why is freshl...

Question

why is freshly prepared soap washed with soft water before casting into moulds

Open in App

Solution

To wash the impurities and colour compounds that may stick to the soap to yield a purer white soap.
Hard water is not used as it will form scum with the soap and cause scaling.

Suggest Corrections

thumbs-up

0

Similar questions

Q. (a) Explain the process of preparation of soap in laboratory.
(b) Why is common salt (sodium chloride) added during the preparation of soap?
(c) Why is soap not suitable for washing clothes when the water is hard?

Q. Why is it essential to wash the precipitate with water before estimating it quantitatively?

Q. What happens when (give balanced equation) [5 MARKS]
(a) Nitric acid is added to KI (aq.)?
(b) Nitric acid is added to washing soda and the resulting gas is passed through a freshly prepared lime water?
(c) Limestone reacts with nitric acid?

Q. Molten cast iron is poured into moulds to make different shapes. Which specialty of cast iron is based for it ?

Q. Why before electroplating ,a brass spoon is first cleaned and then is washed in the hot solution of caustic soda followed by dilute hydrochloric acid and water after which it is thoroughly wash with detergent and several times with distilled water?

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Preparation of Soap Using Caustic Soda

Standard VII Chemistry

Join BYJU'S Learning Program

CrossIcon