Secret of Sour Taste
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.
(b) distilled water
(c) universal indicator
(d) sodium hydrogen carbonate powder
Out of HCl and CH3COOH, which one is a weak acid and why? Describe an activity to support your answer.
Fresh milk has a pH of 6. When it changes into curd (yogurt) will its pH value increase or decrease? Why?
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?
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) 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?