MISSION 07 · CHEMISTRY DISCOVERY
Can you move an acidic sample toward balance without racing past the neutral region?
2 · Follow the Colour Clues
Your new skill: Add controlled drops and follow a changing colour range.
Revisit the skill you will reuse: Previous main-path mission
Match the names to your parts before you build. New parts appear when you first need them. You can point, say the name or show a grown-up.
This container holds and mixes liquids. Its mL marks help us measure volume: how much liquid we use.
Look for: Find the scale and the mL label. One millilitre is a small unit of liquid volume.
Before using it: Put it flat, look at the water level from the side and use readable markings. Ask for a measuring cup if the kit marks are unclear.
Your turn: Point to the 10 mL line without adding powder.
A dropper moves a small amount of liquid, one drop at a time.
Look for: Find its squeeze bulb and narrow tip.
Before using it: Squeeze before dipping, release to draw liquid, then press gently. Rinse between samples. Never mouth-pipette. Drop size can vary.
Your turn: Practise three separate drops of clean water into a tray.
A tube holds a small sample. The stand helps keep tubes upright while we compare them.
Look for: Find the narrow containers and matching holes in the stand.
Before using it: Label samples before filling. Keep them open and stable; never seal a fizzing reaction.
Your turn: Place two empty tubes in the stand and label them A and B.
This spoon measures a repeatable amount of powder so our comparisons use the same amount.
Look for: Find the kit's supplied measure and its labelled amount. A level spoon is flat across the top.
Before using it: Use the approved kit measure, not a random kitchen spoon. Powder amount and spoon size must match the kit batch instructions.
Your turn: Show the difference between level and heaped using an empty spoon and a drawing.
A mixing stick moves liquid and powder together so we can compare how mixing affects a result.
Look for: Find the clean stirrer named in the materials.
Before using it: Use a clean stick for each sample, or rinse and dry between samples. Never taste it.
Your turn: Rehearse a gentle stir in an empty container without splashing.
Citric acid is our labelled acidic material. Dissolved in water it can change an indicator's colour and react with baking soda.
Look for: Find the sealed container with its correct label. Similar-looking powders are not interchangeable.
Before using it: Use only the stated amount, goggles and adult supervision. Experiment materials are not food. Keep away from eyes and mouth.
Your turn: Read the label with a grown-up before opening it.
Baking soda is our labelled mild base. With citric acid and water, the reaction releases carbon dioxide gas.
Look for: Find the container labelled baking soda, not baking powder.
Before using it: Use only the stated amount with adult supervision. Never close a fizzing mixture in a sealed container.
Your turn: Predict where bubbles can escape safely in the open experiment.
These papers give colour clues about acidity. Litmus tells us acid or base clues; pH paper is compared with its matching colour chart.
Look for: Find red or blue litmus, or pH strips with their supplied chart. They are not interchangeable.
Before using it: Use a fresh piece for each sample and read at the stated time. A colour estimate is not an exact laboratory pH or a food safety test.
Your turn: Match an unused strip to its packet and chart.
A tray catches spills, cups hold samples or form a model, and a dry workspace protects our tools.
Look for: Choose the exact container and dry surface in the mission list.
Before using it: Experiment cups stay separate from food and drinks. Keep electronics away from liquids and clean up before storing parts.
Your turn: Show where a spill would land and where electrical parts will stay dry.
A video demonstration will appear here when it is ready. You can follow the written step now.
Before we build, match these names to the parts in front of you. Beaker or measuring cup. This container holds and mixes liquids. Its mL marks help us measure volume: how much liquid we use. Find the scale and the mL label. One millilitre is a small unit of liquid volume. Put it flat, look at the water level from the side and use readable markings. Ask for a measuring cup if the kit marks are unclear. Dropper. A dropper moves a small amount of liquid, one drop at a time. Find its squeeze bulb and narrow tip. Squeeze before dipping, release to draw liquid, then press gently. Rinse between samples. Never mouth-pipette. Drop size can vary. Test tube and stand. A tube holds a small sample. The stand helps keep tubes upright while we compare them. Find the narrow containers and matching holes in the stand. Label samples before filling. Keep them open and stable; never seal a fizzing reaction. Calibrated kit measuring spoon. This spoon measures a repeatable amount of powder so our comparisons use the same amount. Find the kit's supplied measure and its labelled amount. A level spoon is flat across the top. Use the approved kit measure, not a random kitchen spoon. Powder amount and spoon size must match the kit batch instructions. Mixing stick. A mixing stick moves liquid and powder together so we can compare how mixing affects a result. Find the clean stirrer named in the materials. Use a clean stick for each sample, or rinse and dry between samples. Never taste it. Citric acid. Citric acid is our labelled acidic material. Dissolved in water it can change an indicator's colour and react with baking soda. Find the sealed container with its correct label. Similar-looking powders are not interchangeable. Use only the stated amount, goggles and adult supervision. Experiment materials are not food. Keep away from eyes and mouth. Baking soda. Baking soda is our labelled mild base. With citric acid and water, the reaction releases carbon dioxide gas. Find the container labelled baking soda, not baking powder. Use only the stated amount with adult supervision. Never close a fizzing mixture in a sealed container. Litmus and pH paper. These papers give colour clues about acidity. Litmus tells us acid or base clues; pH paper is compared with its matching colour chart. Find red or blue litmus, or pH strips with their supplied chart. They are not interchangeable. Use a fresh piece for each sample and read at the stated time. A colour estimate is not an exact laboratory pH or a food safety test. Tray cup and dry workspace. A tray catches spills, cups hold samples or form a model, and a dry workspace protects our tools. Choose the exact container and dry surface in the mission list. Experiment cups stay separate from food and drinks. Keep electronics away from liquids and clean up before storing parts. Pause and point to the part that will do the main job in this mission. If it is missing or looks different, ask a grown-up before building.
WHAT YOU'LL USE
Kit list: match the named parts to your box and its component cards. Home list: gather these before starting; some may also be supplied in your kit. Reuse components between missions. Stop and ask a grown-up if an essential part or label is missing.
BEFORE YOU BUILD
Wear goggles. Use a fresh pH strip for every test. Do not place used strips back into a solution.
YOUR REWARD
PREDICT BEFORE YOU BEGIN
How many small additions will be easier to control than one big pour?
YOUR CHALLENGE
NEW POWER-UP
Add controlled drops and follow a changing colour range.
You have just practised keep transfers equal and recognise indicator limits. Now: add controlled drops and follow a changing colour range.
BUILD PATH
STEP 1 OF 8
Prepare and label the ACID and BASE solutions using the listed quantities.
A video demonstration will appear here when it is ready. You can follow the written step now.
Prepare and label the ACID and BASE solutions using the listed quantities.
WHAT'S REALLY HAPPENING?
Adding a basic solution can consume some acid and change the pH. The indicator gives an approximate colour range, not an exact pH reading. The required number of drops depends on both solutions and the drop size.
Controlled neutralisation is important in water treatment, agriculture and laboratory work.
FAIR-TEST CHALLENGE
Repeat the mission using 1-drop additions near the neutral region. Compare how precisely you can stop.
WHEN IT DOESN'T WORK YET
WHAT YOU SEE LIKELY REASON TRY THIS FIRST The colour jumps from acidic to basic The additions were too large. Repeat with smaller drop steps near neutral. The result does not change The base solution may be too weak or the dropper may be empty. Check the solution labels and watch a full drop leave the tip. The first test looks wrong The cup or stick may contain residue. Clean the tools and prepare fresh labelled solutions.
CLEAN, RESET AND STORE
Pour the small mixtures down the sink with plenty of water. Discard strips. Rinse and dry all tools.
NEXT SKILL
Compare drop counts with and without soap.