monitoring reactions

Question 1

Reaction Rates

Answer 1

Reaction rate is the change in the amount of reactant and products per unit time (conc/time)

Question 2

Continuous Monitoring

Answer 2

How the product or reactant changes over the complete course of a reaction

Question 3

Measuring formation of a gas

Answer 3

Gas given off - collect in a gas syringe and record how much you have in regular intervals

Question 4

Measure change in mass

Answer 4

Measure change in mass at regular intervals as gas is lost using a mass balance

Question 5

Measuring a colour change and what is a colourimeter

Answer 5

Using a colourimeter (measure absorbance of a particular wavelength of light by a solution)

• Set colourimeter to wavelength interested in measuring
• Calibrate colourimeter sample of distilled water in cuvette place in colourimeter and set to 0
• Carry out creation and take samples of reaction at regular intervals measure absorbance of each one

Question 6

Measure change in PH

Answer 6

Either H+ or OH- ions are produced monitor reaction to see change in PH (can use PH meter)

Question 7

Proccesing Data

Answer 7

Draw conc-time graph (determine Rate)

Question 8

Work out reaction order

Answer 8

• use initial conc of reactant interested in and work out moles
• work out how many moles products have formed
• use balanced equation to work out mole of reactant
• subtract no. of moles of reactant from initial number find no. of moles of reactant at that point
• divide no of moles of reactant by volume of reaction mixture to find conc of reactant at that point