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A student uses lime water to test the gas evolved as a result of action of dilute HCl on solid sodium carbonate. The chemical compound present in lime water is :
  • a)
    calcium sulphate
  • b)
    calcium chloride
  • c)
    calcium hydroxide
  • d)
    calcium nitrate
Correct answer is option 'C'. Can you explain this answer?
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A student uses lime water to test the gas evolved as a result of actio...
The Chemical Formula of lime water is Ca(OH)2    (Calcium Hydroxide)
Carbon dioxide gas is evolved as a result of action of dilute HCl on solid sodium carbonate.

2HCl + Na2CO3 → 2 NaCl + CO2 + H2O

Carbon dioxide gas turns lime water to milky
CO2 + Ca(OH)2 → CaCO3
 
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A student uses lime water to test the gas evolved as a result of actio...
the chemical compound found in lime water is calcium hydroxide because it is the chemical name of lime water
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A student uses lime water to test the gas evolved as a result of actio...
Answer:

Introduction:

In this experiment, a student is using lime water to test the gas evolved as a result of the action of dilute hydrochloric acid (HCl) on solid sodium carbonate (Na2CO3). Lime water is a common solution used to detect the presence of carbon dioxide (CO2) gas. It is a solution of a chemical compound known as calcium hydroxide (Ca(OH)2).

Explanation:

When hydrochloric acid reacts with sodium carbonate, it produces carbon dioxide gas, water, and a salt. The balanced chemical equation for this reaction is:

2HCl + Na2CO3 → 2NaCl + H2O + CO2

The carbon dioxide gas produced during this reaction can be tested using lime water. Lime water, which is a clear, colorless solution, turns milky or cloudy when carbon dioxide gas is bubbled through it. This is due to the formation of a white precipitate called calcium carbonate (CaCO3). The reaction between carbon dioxide gas and calcium hydroxide can be represented as:

CO2 + Ca(OH)2 → CaCO3 + H2O

The white precipitate of calcium carbonate gives the lime water its milky appearance.

Conclusion:

Therefore, the chemical compound present in lime water is calcium hydroxide (Ca(OH)2), which reacts with carbon dioxide gas produced during the reaction between hydrochloric acid and sodium carbonate to form calcium carbonate (CaCO3).
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Read the given passage and answer the question :A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).Q. “A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, and each salt of which when dissolved in distilled water will make it hard.”

Read the given passage and answer the question :A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).Q. Hardness of water is due to

Read the given passage and answer the question :A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).Q. Hardness of water is calculated in terms of

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A student uses lime water to test the gas evolved as a result of action of dilute HCl on solid sodium carbonate. The chemical compound present in lime water is :a)calcium sulphateb)calcium chloridec)calcium hydroxided)calcium nitrateCorrect answer is option 'C'. Can you explain this answer?
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A student uses lime water to test the gas evolved as a result of action of dilute HCl on solid sodium carbonate. The chemical compound present in lime water is :a)calcium sulphateb)calcium chloridec)calcium hydroxided)calcium nitrateCorrect answer is option 'C'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about A student uses lime water to test the gas evolved as a result of action of dilute HCl on solid sodium carbonate. The chemical compound present in lime water is :a)calcium sulphateb)calcium chloridec)calcium hydroxided)calcium nitrateCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A student uses lime water to test the gas evolved as a result of action of dilute HCl on solid sodium carbonate. The chemical compound present in lime water is :a)calcium sulphateb)calcium chloridec)calcium hydroxided)calcium nitrateCorrect answer is option 'C'. Can you explain this answer?.
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