Acids and alkalis

1. If Magnesium hydroxide (indigestion powder) were added to vinegar which of the answers would best describe what would happen?
2. Water would be best described as
pH6
A weak acid
pH7
Neutral
pH8
Weak alkali
pH1
Strong acid
3. If weak lemon juice was added to Universal Indicator what colour would it turn?
Purple
Strong alkali (pH 13,14)
Red
Strong acid (pH 1or 2)
Blue
Weak alkali (pH8, 9 or 10)
Yellow
Weak acid (pH5 -6)
Green
Neutral (pH7)