Chemistry · Physical Chemistry
Find how temperature changes reaction rate with antacid tablets
Time how long an effervescent tablet takes to dissolve at different water temperatures.
- DifficultyEasy
- Estimated time1–3 hours
- BudgetUnder ₹250
- ClassClass 8–11
- TeamSolo or up to 2
- You needHousehold materials
Prerequisites: None beyond your class work
Original · by TechnifyedExperimentScience Fair ProjectBeginner friendlyLow costWell documented
Overview
Time how long an effervescent tablet takes to dissolve at different water temperatures.
Why build this?
It gives a clear graph of rate against temperature with a reaction that is safe and quick.
What you will learn
- How temperature affects the speed of particles
- What collision theory says
- How surface area changes rate
Skills you will use
Safety
- Hot surfaces and liquids can burn. Use tongs or oven gloves and let things cool before touching them.
Materials and tools
- Six effervescent antacid or vitamin tablets
- Water at 10, 25, 40 and 60 °C
- Identical glasses
- Thermometer
- Stopwatch
Tools and software
Step-by-step roadmap
Start
You will finish with: a graph showing the reaction speeding up with temperature and with surface area.
- 1
Prerequisites
Nothing special to know first. Then collect the 5 items in the materials list.
- 2
Learn
- How temperature affects the speed of particles
- What collision theory says
- How surface area changes rate
- 3
Plan
Write your question, your hypothesis and the one thing you will change. Draw the table you will fill in before you start.
- 4
Build
- Put 150 ml of water at a measured temperature in a glass.
- Drop in one tablet and time until the fizzing stops.
- Repeat at each temperature.
- Repeat one temperature with a crushed tablet.
- Plot time against temperature.
- 5
Test
Repeat every reading at least three times and check the result against what the science predicts.
- 6
Document
Record every reading with its unit, photograph the setup and draw a graph of the result. Report structure
- 7
Present
Explain the question, the method and the graph in two minutes; keep the setup ready to demonstrate. Presentation structure · Viva questions
- 8
Publish
Share the report and photos with your class, a science fair or your school magazine.
Expected outcome
A graph showing the reaction speeding up with temperature and with surface area.
Other versions of this project
Beginner version
Compare cold and hot water only.
Advanced version
Collect the gas in an upturned measuring cylinder and plot volume against time.
Make this project better
- BasicCompare cold and hot water only.
- This projectFind how temperature changes reaction rate with antacid tablets
- AdvancedCollect the gas in an upturned measuring cylinder and plot volume against time.
Science fair mode
Text marked "You write this" is a prompt for your own work; everything else is specific to this project.
- Problem
- You write thisWrite your question as: How does [what you change] affect [what you measure]?
- Hypothesis
- If the water is hotter, then the tablet will dissolve faster.
- Variables
- Independent: water temperature. Dependent: time to dissolve. Controlled: water volume, tablet type
Materials and procedure are in Materials and the Roadmap.
Observation table
You write thisDraw a table with one column for what you change, one for each repeat reading and one for the average.
- Graph
- You write thisPlot what you changed along the bottom and what you measured up the side; use a bar chart for categories and a line graph for numbers.
- Results
- You write thisState what the graph shows in one or two sentences, with numbers.
- Conclusion
- You write thisSay whether the result supports your hypothesis and why you think so.
Display board
- Title and your name
- Question
- Hypothesis
- Materials
- Procedure (with photos)
- Data table and graph
- Conclusion
- What you would do next
Questions judges ask
- Why does heat speed up the reaction?
- Why does a crushed tablet react faster?
- What gas is produced?
- What would you change if you did this again?
- What was your biggest source of error, and how did you reduce it?
- Where is this idea used in real life?
Working as a team
Solo or up to 2. Suggested roles:
Report and presentation
Report structure
- Title and question
- Background: the science behind it
- Hypothesis
- Materials
- Method (steps, with a diagram or photo)
- Observations (table)
- Results (graph and calculation)
- Sources of error
- Conclusion
- What you would do next
- References
Presentation structure
- The question
- Why it matters
- The idea behind it
- Setup (photo)
- Method in three steps
- Results (one clear graph)
- What the result means
- Errors and limits
- Conclusion and next step
Viva questions
Try answering before you open each one.
Why does heat speed up the reaction?
Particles move faster, so they collide more often and with more energy.
Why does a crushed tablet react faster?
It has more surface area exposed to the water.
What gas is produced?
Carbon dioxide.
Resources
Source and attribution
Original
Written by Technifyed. Free to use for your own school or college project; write the report in your own words. Added 1 Oct 2026.
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