Chapter 7 Laboratory: Solubility and Solutions 139q: 2 You need to make up 100 mL of 0.5 M sulfuric acid. The concentrated sulfuric acid you have on hand lists its density as
1.84 g/mL. Is this sufficient information for you to make up the 0.5 M bench solution? If not, why? If so, how much concentrated
sulfuric acid would you dilute to make 100 mL of 0.5 M sulfuric acid?
q: 3 You have on hand 100 mL of concentrated phosphoric acid. The label lists the mass percentage as 85.0% and the density as
1.68 g/mL. How much 2.00 M phosphoric acid solution could you make up from this amount of the concentrated acid?
q: 4 You have on hand some concentrated muriatic acid from the hardware store that lists its contents as 31.45% HCl. You want
to make up 1 L of 1.00 M HCl, but you are concerned that the mass percentage listed on the bottle may be inaccurate. You tare a
100 mL volumetric flask and use it to determine that 100 mL of your acid has a mass of 116.03 g. Based on that information, is the
mass percentage listed on the bottle accurate? If not, by how much does it differ from the actual value?