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12.3Unit 2: Dissolving, solubility and chromatography

Planning a solubility investigation — Cambridge Checkpoint Science 0893 Revision Notes & Topical Questions

5 min read 7 parts Lesson 3 of 4 1 quiz

📚 Cambridge Checkpoint Science 0893 Hub / Topical Revision
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Lesson summary

12.3 Planning a solubility investigation — CHECKPOINT (CHEMISTRY) notes: Plan and carry out a fair investigation of how temperature affects solubility.Independent variable = the variable you change: the temperature of the waterDependent variable = the variable you measure: the nu…

  • Control variables
  • Volume of water
  • Temperature range
  • Keeping temperature
  • Equipment and safety
  • Written plan

Section 1 of 7Variables in the investigation

Independent variable
Independent variable the variable you change: the temperature of the water
Dependent variable
Dependent variable the variable you measure: the number of spatulas of salt that dissolve
Control variables
Control variables variables kept the same, such as the volume of water and the size of the spatula

Section 2 of 7Planning the investigation

Volume of water
  • Volume of water choose a volume to use each time, e.g. 50 cm3
Temperature range
  • Temperature range the highest and lowest temperatures, e.g. 20 °C to 80 °C
Interval
  • Interval the gap between temperatures, such as 10 °C or 5 °C
Keeping temperature
  • Keeping temperature decide how to change and hold the temperature while adding salt
Equipment and safety
  • Equipment and safety list the equipment and carry out a risk assessment

Section 3 of 7Results table and repeats

Table
  • Table plan columns, headings and units before starting
Readings
  • Readings decide how many readings to take and whether to repeat tests
Written plan
  • Written plan include a step-by-step method before carrying out the investigation

Section 4 of 7Presenting results

Graph
  • Graph put the independent variable on the horizontal axis and the dependent variable on the vertical axis
Axis label
  • Axis label e.g. number of spatulas of salt dissolved
Evaluation
  • Evaluation judge the accuracy of the results and suggest improvements

Section 5 of 7Accurate and reliable

Accurate
  • Accurate results close to the true value
Reliable
  • Reliable results that can be repeated and agree
Range and interval
  • Range and interval a suitable range and interval give enough results to see a pattern

Section 6 of 7Key terms

TermMeaning
Independent variableThe variable that is changed.
Dependent variableThe variable that is measured.
Control variableA variable kept the same.
RangeHighest and lowest values used.
IntervalGap between values.
ReliableGives similar results when repeated.

Section 7 of 7Exam technique

1
Changing the temperature and the volume of water together.
2
Putting the dependent variable on the horizontal axis.
3
Leaving out units in the results table.
4
Taking too few readings across too small a range.

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