2. Chemist use a number denoted by pH to describe quantitatively the acidity or basicity of solutions. By definition, pH = -log[H+] where H+ is the hydrogen ion concentration in moles per liter. Approximate the pH of each substance : i. Vinegar : [H+] = 6.3 x 10-3
ii. Carrots : [H+] -1.0 x 10-5
iii. Sea water : [H+] - 5.0 x 10-9

3. A gas in a piston has an initial volume of 0.01 m3 at a pressure of 250 kNm-2. The gas is then compressed to a pressure of 800 kNm-2 according to the law P(V)1.2 = C where C is a constant. Find the volume.​