Chemistry
Answer the following questions related to salts and their preparations:
(a) What is a 'salt' ?
(b) What kind of salt is prepared by precipitation?
(c) Name a salt prepared by direct combination. Write an equation for the reaction that takes place in preparing the salt you have named.
(d) Name the procedure used to prepare a sodium salt such as sodium sulphate.
Acids Bases Salts
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Answer
(a) Salt is a compound formed by the partial or total replacement of the ionisable hydrogen atoms of an acid by a metallic ion or an ammonium ion.
(b) An insoluble salt can be prepared by precipitation.
(c) A salt prepared by direct combination is Lead(II) Sulphide.
Pb + S PbS
(d) By neutralisation of alkali (caustic soda) with acid (dilute sulphuric acid):
2NaOH + H2SO4 ⟶ Na2SO4 + 2H2O
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Related Questions
Select the word/s given below which are required to correctly complete the blanks — [ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt water] :
(i) A solution M turns blue litmus red, so it must contain (i) …………… ions ; another solution O turns red litmus blue and hence, must contain, (ii) …………… ions.
(ii) When solution M and O are mixed together, the products will be (iii) …………… and (iv) …………… .
(iii) If a piece of magnesium was put into a solution M,(v) …………… gas would be evolved.
Define the following and give two examples in each case : (a) a normal salt, (b) an acid salt, (c) a basic salt.
Explain the following methods with examples:
(a) Direct combination
(b) Displacement
(c) Double decomposition (precipitation)
(d) Neutralization of insoluble base
(e) Neutralization of an alkali (titration)
How would you prepare copper sulphate crystals from a mixture of charcoal and black copper oxide.