C1- Investigating the reactions of acids, including temperature changes that occur

metal + acid →

salt + hydrogen

acid + base →

salt + water

acid + metal carbonate →

salt + water + carbon dioxide

whats base is this

base is a substance that will neutralise an acid; an alkali is a soluble base

most metal oxides are:

• insoluble

• soluble

insoluble

sodium hydrogen and potassium dissolve in water (alkalis)

Acids are very specific chemicals:

• They are soluble

• They release H⁺ ions when dissolved in water

• They all have a pH less than 7

Method

Method

1. Fill the basin and test-tube with water, let the test tube rest on the bottom of the basin

2. Measure 15 cm° of hydrochloric acid using the measuring cylinder and add to the boiling tube

3. Add the magnesium strip to the boiling tube - ensuring that the magnesium is fully immersed in the acid by swirling and allow the reaction to proceed for 10s

4. After 10s, place the delivery tube onto the boiling tube and place the end of the glass tube underneath the test-tube.
   Hold the test-tube upright and collect the gas produced. Once the test-tube is full, stopper the tube and place it in the test-tube rack.

5. Light a splint. Remove the stopper of the test-tube and hold the lit splint at the top of the test tube.

Observatios

fizzing in boiling tube

magnesium disappears

boiling

lig tube becomes warm and heat is given off

gas rises to the to the test tube as hydrogen is less dense than air and insoluble in water

lit split over test tube squeaky pop