A. METALS + ACIDS: Methods

A. Methods
1.Continuous vs discontinuous method?
2.Alternative continuous methods?
3.Gas syringe use only enough?
4. Maximum size of gas syringe?
5.Using change in mass to find rate
6.Titration method?
7.Quenching followed by titration?
8.Quenching, as applied to Zn + acid?
9.Sample quenching followed by titration?
10.E_a - rate followed by pH change
11.Set-up and calculations for Group 2 metals
12.Temperature rises with HCl and ethanoic acid
13.Rate from gas volume vs time?
14.How to change HCl concentration?
15.Catalyst for Mg + acid reaction?
16.What graph to determine rate - do I use V_final - V_t?
 
B. Initial rates
1.Use of 1/time for 30 cm³ gas as rate?
2.Taking initial rates from volume vs time data?
3.Initial rate from gas volume?
4.What to use for initial rate?
5.Why is 1/time used for rate?
6. Background to initial rate method?
7. Initial rate vs half-life method?
8. Effect of Mg surface area on initial rate?
9.Timing disappearence of Mg or plotting gas volume?
10.Rate from gas volume vs time?
 
C. Temperature control
1. Use of waterbath to control temp?
2. How to carry out at constant temperature?
3. How to control temperature?
4. Effect of exothermic reaction on volume of hydrogen?
5. Temperature rise of 2 deg significant?
6.Use of waterbath - room temperature?
 
D. Amounts to use
1. Reacting masses to use?
2. Reacting amounts to use?
3. Correct amount of Zn for < 100 cm³ gas?
4. How to prove acid in excess?
5. Checking acid is in excess?
6. How to work out if excess aci?
7. Effect of not using excess acid?
8. Overall order from exact amounts?
9.Calculating excess acid
 
E. Miscellanous
1. How to prevent slowing at higher concentrations?
2. Slower reaction at higher concentrations of sulphuric acid?
3. Why slower at high concs for H₂SO₄?
4. Why is sulphuric acid reacting slower?
5.Include all experimental results?

updated: 11 April 2009