pH

Question 1

define pH

Answer 1

scale used to measure strength of acids and alkalis
less than seven – acidic
seven – neutral
more than seven – alkaline

Question 2

what pH does distilled water has

Answer 2

7`

Question 3

what is a pH indicator

Answer 3

substance that is one colour in acidic solution and another colour in acidic solution
indicators can only distinguish between acid and alkali not tell ab actual value

Question 4

what is the colour change for litmus

Answer 4

blue to red

Question 5

what is the colour change for methyl orange

Answer 5

yellow to red

Question 6

what is the colour change for screened orange

Answer 6

green to red

Question 7

what is the colour change for phenolphthalein

Answer 7

pink to colourless

Question 8

what is universal indicator

Answer 8

chemical that can give approximate pH of solution
estimate because its subjective

Question 9

what gives an accurate value for pH

Answer 9

pH meter
consists of measuring probar connected to electronic meter which displays pH reading