ACIDS, BASES AND SALTS

Neutralization reactions

• formed from joining positive and negative ions 
• increases OH ions
• froms a salt and water
• increases H2O ions

Which type of ions are produced by bases when they are mixed with water?

• OH^-

• H⁺

• H₂O

• HCl

Anything with a pH of 7 is a(n)

• neutral substance

• acid

• base

• chemical salt

A weak base will have a pH close to

• 8

• 6

• 0

• 14

A very strong acid will have a pH of

• 0

• 14

• 5

• 9

How are metal oxides formed?

• When metals react with oxide.
• When metals react with water.
• When metals react with air.
• When metals react with oxygen.

Which of the following values would represent the pH of a strong base?

• 1

• 8

• 7

• 13

An aqueous solution turns red litmus blue, excess addition of which of the following would reverse the change?

• baking powder

• lime

• ammonium hydroxide solution

• HCL

If a few drops of concentrated acid accidentally spills over the hand of a student,what should be done

• wash the hand with saline solution
• wash the hand immediately with plenty of water and apply a soln of sodium hydrogen carbonate
• after washing apply soln of sodium hydroxide
• neutralise the acid wih a strong alkali

Sodium hydrogen carbonate when added to acetic acid evolves a gas . Which of the statement is true about the gas evolved?

• it turns lime water milky

• it burns with a pop sound

• it changes the solution colourless

• it has a pungent smell