Question

N
1 A student investigates the movement of acid into different sized blocks of agar. The agar contains
the indicator phenolphthalein. This indicator is purple in a pH of greater than 8 and colourless in a
pH of less than 8.
Two agar blocks of dimensions 2cm x 2 cm x 2 cm and 1 cm x 1 cm x 1 cm are labelled A and B
respectively and placed in separate beakers as shown in Fig. 1.1.
agar cube
2 cm x 2 cm x 2 cm
agar cube
1 cm x 1 cm x 1 cm
beaker A
beaker B

Answer 1

Answer:

beaker a is the correct answer

Answer 2

Answer:

in alkaline solution,the chemical has a sulfonate structure that gives the solution a purple colour