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Acids & Bases treasure hunt

Delve into the world of chemistry with our Acids & Bases GPS scavenger hunt! Discover how acids and bases work as you navigate through the city. From pH values to neutralisation reactions - learn all about these fundamental chemistry concepts in an interactive way.

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Made 2 days ago: Enkhuizen city walk in Enkhuizen

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Featured this week: example questions for Acids & Bases

New example questions from the library every Monday. Updated on 12 October 2026.

What happens when you put baking soda (bicarbonate of soda) in vinegar?
It will foam and bubble It gets very hot It gets very cold Nothing happens
Which drink fizzes and is slightly sour?
Spa red (sparkling water) Ordinary water Milk Tea
What is heartburn?
An acid in your belly A sweet liquid A base Water
What happens to your teeth when you eat a lot of acidic things?
They can be damaged They become whiter They grow faster They are getting stronger
What feeling do you get from soap in your eyes?
It stings (because soap is a base) It feels nice You see better Your eyes turn blue
What does a lemon taste like?
Acid Sweet Salt Bitter
What colour will red litmus paper turn when you put it in soap?
Blue Green Yellow Orange
What colour does red cabbage get with soap?
Green Red Orange Black
Create a acids & bases treasure hunt for Ages 7-8
What does the abbreviation pH mean?
Measuring acidity Pure water Plastic holder Taste it
What is the pH range?
From 0 to 14 From 1 to 10 From -7 to +7 From 0 to 100
What is the approximate pH of milk?
6.5 (slightly acidic) 7 (neutral) 8.5 (slightly basic) 3 (strong acid)
What pH does rainwater usually have?
About 5.5 (slightly acidic) Exactly 7 (neutral) About 9 (basic) About 2 (strong acid)
What is ammonia?
A strong base A weak acid A neutral substance A salt
What is a buffer solution?
A solution that keeps its pH constant A solution that is always neutral A solution that is highly acidic A solution that changes pH very quickly
What can you do if you accidentally get acid on your skin?
Rinse immediately with plenty of water Let it sit until it dries Putting soap on it Put vinegar on it
What is the pH of pure lemon juice?
About 2 (strong acid) About 7 (neutral) About 10 (basic) About 5 (weakly acidic)
Create a acids & bases treasure hunt for Ages 11-12
Which substance is used as an antacid?
Sodium hydrogen carbonate (NaHCO₃) Hydrochloric acid (HCl) Sulphuric acid (H₂SO₄) Nitric acid (HNO₃)
What property do acids have in common?
They emit protons (H⁺) They absorb protons They always have pH 1 They always contain sulphur
Which theory describes acids as proton donors?
Brønsted-Lowry theory Arrhenius theory Lewis theory Dalton theory
What is a buffer?
A solution that combats pH changes A very strong acid A neutral solution An indicator
Which substance is formed in the reaction between zinc and hydrochloric acid?
Hydrogen gas Oxygen gas Carbon dioxide Nitrogen gas
Which ion is responsible for the basic properties of a solution?
OH- (hydroxide ion) H⁺ (hydrogen ion) Na⁺ (sodium ion) Cl- (chloride ion)
Which substance in the stomach causes the acidic pH?
Hydrochloric acid (HCl) Acetic acid (CH₃COOH) Citric acid Lactic acid
Which ions make a solution acidic?
H⁺ ions (hydrogen ions) OH- ions (hydroxide ions) Na⁺ ions (sodium ions) Cl- ions (chloride ions)
Create a acids & bases treasure hunt for Ages 13-14
Which of the following can act as a buffer component?
Na₂HPO₄ NaCl HCl NaOH
Which of the following compounds is a Lewis base?
NH₃ BF₃ HCl SO₃
Which of the following acids has the highest pKa value?
NH₄⁺ HF CH₃COOH HCN
What happens at the equivalence point during an acid-base titration?
The number of moles of acid is equal to the number of moles of base The pH is always 7 The indicator changes colour Conductivity is minimal
Which factor does NOT affect the acidity of organic acids?
The molar mass Electronegativity of neighbouring atoms Inductive effects Resonance stabilisation
Which of the following statements about polyprotic acids is correct?
Ka1 > Ka2 > Ka3 Ka1 < Ka2 < Ka3 Ka1 = Ka2 = Ka3 There is no pattern in Ka values
Which of the following solutions has the highest pH?
0.1 M NaOH 0.1 M NH₃ 0.1 M NaCl 0.1 M CH₃COONa
What is the definition of pKw?
-log(Kw) -log([H⁺]) -log([OH-]) log(Kw)
Create a acids & bases treasure hunt for Ages 17-18
Which compound shows the strongest basic character?
Oxide ion (O²-) Hydroxide ion (OH-) Ammonia (NH₃) Acetate ion (CH₃COO-)
What happens to the pH when you dilute an acid solution with distilled water?
The pH increases (becomes less acidic) The pH decreases (becomes more acidic) The pH remains the same The pH becomes neutral
What is the pH of a polyprotic acid solution mainly determined by?
The first ionisation step The final ionisation step The average of all ionisation steps The strongest ionisation step
Which substance is used as the primary standard in acid-base titrations?
Potassium hydrogen phthalate (KHC₈H₄O₄) Sodium hydroxide (NaOH) Hydrochloric acid (HCl) Acetic acid (CH₃COOH)
What colour is methyl orange in a strongly basic solution?
Yellow Red Blue Colourless
Which acid is the main component of heartburn?
Hydrochloric acid (HCl) Sulphuric acid Acetic acid Lactic acid
Which buffer has the best buffering capacity at pH 4.76?
Acetic acid/acetate buffer Phosphate buffer Tris buffer Ammonia/ammonium buffer
What is the product of [H⁺] × [OH-] in an aqueous solution at 25°C?
1,0 × 10-¹⁴ 1,0 × 10-⁷ 14 7
Create a acids & bases treasure hunt for Ages 18+

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Other Chemistry subjects

Periodic Table Atoms & Molecules Chemical Reactions Water & Hydrogen States of Matter Mixtures & Solutions Crystals Food Chemistry Fireworks & Pyrotechnics Metals Gases Fuels & Energy

Frequently asked questions

A Acids & Bases scavenger hunt is a GPS-guided outdoor activity with quiz questions about Acids & Bases, part of the theme Chemistry. You walk a route past various locations and answer fun questions along the way.

There are 2925 questions available about Acids & Bases: 2925 multiple choice questions, 0 open questions and 0 assignments. The category Chemistry has more than 43772 questions in total.

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