Comparing E170I - Calcium carbonate vs E170II - Calcium hydrogen carbonate
Overview
Synonyms
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Found in 1,512 products
Found in 5 products
Search rank & volume
Awareness score
Search volume over time
Interest over time for 4 keywords in U.S. during the last 10 years.
Interest over time for 4 keywords in U.S. during the last 10 years.
Popular questions
What is chalk made of?
Traditional chalk is mostly calcium carbonate (CaCO3), a naturally occurring mineral; some modern blackboard “chalk” sticks may instead use calcium sulfate (gypsum).
What is chalk paint?
It’s a matte decorative paint that uses calcium carbonate as a white pigment/filler to create a chalky, velvety finish with good coverage and adhesion.
How to make chalk paint?
Stir calcium carbonate powder into a little water to make a slurry, then mix it into latex/acrylic paint—about 2–3 tablespoons calcium carbonate per 1 cup of paint—adjusting to reach the desired texture and coverage.
Can you eat chalk?
Food‑grade calcium carbonate (E170i) used in foods and supplements is considered safe at permitted levels, but eating non‑food‑grade chalk sticks isn’t advised and excessive intake can cause constipation or high‑calcium effects.
What is calcium carbonate used for?
In foods, E170i is used mainly as a white colorant and stabilizer and as a source of calcium; beyond food, it’s common in antacids and as a filler/pigment in tablets, paints, paper, and plastics.
How does calcium carbonate neutralize stomach acid?
Calcium hydrogen carbonate (E170ii) neutralizes stomach acid via an acid–base reaction: Ca(HCO3)2 + 2 HCl → CaCl2 + 2 CO2 + 2 H2O, raising gastric pH.
When calcium carbonate is added to hydrochloric acid?
Calcium hydrogen carbonate reacts with hydrochloric acid to effervesce (release CO2) and form calcium chloride and water: Ca(HCO3)2 + 2 HCl → CaCl2 + 2 CO2 + 2 H2O.
How does calcium carbonate neutralize acid?
Its bicarbonate ions consume H+ to form carbonic acid, which decomposes to CO2 and water, leaving a neutral calcium salt (e.g., CaCl2).
Why does calcium carbonate dissolve in acid?
Acidic H+ converts carbonate/bicarbonate into CO2 and water, removing carbonate from the solid and driving dissolution; calcium hydrogen carbonate itself is soluble in water.
How does calcium carbonate reduce acid rain?
Calcium hydrogen carbonate isn’t used to prevent acid rain, but carbonate/bicarbonate alkalinity neutralizes acidic waters; industrially, limestone or lime (not Ca(HCO3)2) scrubs SO2 from flue gases, reducing acid‑rain precursors.