Acids and Alkalies
ORWhat is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write chemical equation for the reaction involved.
Out of HCl and CH3COOH, which one is a weak acid and why? Describe an activity to support your answer.
Write the name and chemical formula of the calcium compound used for disinfecting drinking water. How is this compound manufactured?
Fresh milk has a pH of 6. When it changes into curd (yogurt) will its pH value increase or decrease? Why?
Write the chemical formula for washing soda. How may it be obtained from baking soda? Name an industrial use of washing soda other than washing clothes.
Write the chemical formula for bleaching powder. How is bleaching powder prepared? For what purpose is it used in paper factories?
The pH values of three solutions A, B, and C having equal molar concentration are respectively 2.0, 7.0, and 13.0 at 298 K. Which of the three solutions represents an acid solution?
(a) Write the chemical name and formula of bleaching powder.
(b) Why does bleaching powder smell of chlorine when exposed to air?
(c) Write chemical equation to represent the action of dilute hydrochloric acid on bleaching powder.
Given below are the pH values of four different liquids:
7.0, 14.0, 4.0, 2.0
Which of these could be that of
(i) lemon juice,
(ii) distilled water,
(iii) 1 M sodium hydroxide solution,
(iv) tomato juice
(i) Name the raw materials used in the manufacture of sodium carbonate by Solvay process.
(ii) How is the sodium hydrogen carbonate formed during Solvay process separated from a mixture of NH4Cl and NaHCO3?
(iii) How is sodium carbonate obtained from sodium hydrogen carbonate?
(i) An aqueous solution has a pH value of 7.0. Is this solution acidic, basic or neutral?
(ii) If H+ concentration of a solution is 1 x 10-2 mol L-1, what is the pH value for it?
(iii) Which has a higher pH value, 1 M HC1 or 1 M NaOH solution?