Question 4:
Name a few common indicators used in laboratories?
Litmus indicator, pH paper, methyl orange ,phenolphthalein etc. are the few common indicators used in laboratories .
(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.
(b) Name an acid-base indicator extracted from lichen.
(c) What colour does the methyl orange turn to when put in an acidic solution ?
Question 2:
Name three acids used in the laboratory.
(a) Name three acids used in the laboratory.
(b) Name one indicator that turns red on adding a base.
(c) Name the reaction when an acid is mixed with a base.
(d) Write the name of two indicators that occur naturally.
(e) Name three types of salts. Give one example of each type of salt.