How Does Compound X React With Hydro Chloric Acid

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1. Observation.
- Compound X is a white powder. It is a solid.

2. Questions.
- What is compound X?
- What will happen when compound X is heated and reacted with C20H14O4 (phenolphthalein – an acid-base indicator)? (1)
- How does compound X react with C20H14O4 (phenolphthalein)? (2)
- How does compound X react with water? (3)
- How does compound X react with hydro chloric acid (HCL)? (4)

3. Predictions.
- Compound X is calcium carbonate (CaCO3).
- (1) When compound X is heated and reacted with C20H14O4, the substance will turn pink.
- If a red litmus paper is dipped in the substance moistened with de-ionized water, it will turn blue.
- (2) When C20H14O4 is added to compound X, the product will be a white liquid, and no other change will occur.
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- (4) When hydro chloric acid (HCL) is added to compound X, there will be a reaction with products water and salt.

4. Hypotheses.
- It is CaCO3 because it is also a white powder with the same chemical properties.
- (1) The substance will turn pink, and the red litmus paper will turn blue because it is a base. It is a base because when salt (metal + nonmetal) is heated, it decomposes (salt = metal/metal oxide + nonmetal/nonmetal oxide). The metal/metal oxide is a base/basic oxide.
- The red litmus will turn blue due the same reason as above.
- (2) No change will occur because it is a salt.
- (3) The substance will dissolve because most powders dissolve in water.
- (4) There will be a reaction between compound X and HCL (with products water and salt (if compound X is a base/salt)) because acid + base/salt = salt + water (+
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Subsequently, hydro chloric acid is added to the powder with a dropper pipet. This will determine what the released gas is (if there is any). (4)
7. Observations.
The red litmus paper stays red when dipped in compound X reacted with de-ionized water. In (1) the substance has turned into a pink liquid. In (2) the product, that is observed, is a colorless liquid. Compound X has dissolved a little bit, and there is no change in color. In (3) observations show that the unknown substance almost does not dissolve in water. The product of the experiment is a white liquid, which is cloudy. In (4) the observed product is a white liquid. There can be heard a noise of aeration and bubbles are observed appearing. In the additional procedure, the candle goes out (the flame dies).

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