The questions are:
1) Two neighbouring factories produce large amounts of effluent that they have to dispose of safely. One effluent is acidic and the other is basic. 25.0 mL of one effluent required 29.5 mL 0.233 mol/L sulfuric acid for exact neutralisation. 25.0 ml of the other required 32.8 mL 0.274 mol/L sodium hydroxide for exact neutralisation. What volume of the first effluent should be mixed with 100 mL of the second in order to produce neutral effluent?
2) A mixture of sodium dihydrogen phosphate and sodium hydrogen phosphate is widely used in laboratories to buffer solutions at PHs of around 7. Explain how this combination of salts maintains approximately constant PH even when small amounts of HCl or NaOH are added to the solutions.
I do not know how to solve the first question without knowing the formulas of the acid and base to use molar ratios.
For the second one, is it because they are both amphirpotic so when an acid is added they acts as proton acceptors and grab the hydrogen ions and when a base is added they act as proton donors and give the hydroxyl a hydrogen so the PH remains constant at 7?
1) Two neighbouring factories produce large amounts of effluent that they have to dispose of safely. One effluent is acidic and the other is basic. 25.0 mL of one effluent required 29.5 mL 0.233 mol/L sulfuric acid for exact neutralisation. 25.0 ml of the other required 32.8 mL 0.274 mol/L sodium hydroxide for exact neutralisation. What volume of the first effluent should be mixed with 100 mL of the second in order to produce neutral effluent?
2) A mixture of sodium dihydrogen phosphate and sodium hydrogen phosphate is widely used in laboratories to buffer solutions at PHs of around 7. Explain how this combination of salts maintains approximately constant PH even when small amounts of HCl or NaOH are added to the solutions.
I do not know how to solve the first question without knowing the formulas of the acid and base to use molar ratios.
For the second one, is it because they are both amphirpotic so when an acid is added they acts as proton acceptors and grab the hydrogen ions and when a base is added they act as proton donors and give the hydroxyl a hydrogen so the PH remains constant at 7?
