Hazard[ 683] - Na2S2O3+HCl PDF

Preview

Summary

Na2S2O3+HCl...

Description

Hazard Test tubes may break

Acid may splash in eyes Water spills

Control measures Place them is the glass bin Wear safety goggles and full safety gear

Keep electronics away and use the spill tray when conducting the prac.

Research question

Does changing the concentration of the acid in a solution of acid and water affect the amount of time it takes for the solution to go opaque?

Independent variable

The concentration of the acid

Dependent variable

The time taken for acid to go opaque

Controlled variables

Amount of Sodium Thiosulfate

Materials 

Identify quantities and sizes for all pieces of equipment to be used



Identify concentrations and amounts for all chemicals to be used

Method



Use a neat labelled diagram(s) to briefly outline your modification to the original method



Identify the specific independent and dependent variables you will investigate



Identify the sample size for your independent variable



Identify the number of trials you plan to complete at each setting

Data 

1. Measure amount of sodium thiosulfate solution and water refer to data table. 2. Start with 10ml sodium thiosulfate and 40ml water and 5ml hydrochloric acid. 3. Measure acid and water in measuring cylinder. 4. Place acid in beaker. 5. Add the specific amount of water. 6. Start stopwatch 7. Time how long it takes for the reaction mixture to turn opaque. 8. Wait for circle on bottom of beaker to disappear 6. Record your observations of this reaction. 7. Repeat 3 times to find average. 8. Repeat for all concentrations in the data table. 9. Discard your reaction liquid into the waste container, rinse and return your materials.

Average time taken for X to disappear and put data in a table

What type of data will you collect?

Concentration of thio (ml)

Volume of Water (ml)



How will you analyse your data?

10 15 20 25 30

40 35 30 25 20



Design a Raw Data table here.

Time taken (Run 1)

Time taken (Run 2)

Time taken (Run 3)

Average Time Taken...