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Questions and Answers
What gas is released at the cathode when an electric current is passed through a saturated solution of sodium chloride?
What gas is released at the cathode when an electric current is passed through a saturated solution of sodium chloride?
Hydrogen gas
What gas is released at the anode when an electric current is passed through a saturated solution of sodium chloride?
What gas is released at the anode when an electric current is passed through a saturated solution of sodium chloride?
Chlorine gas
At what temperature does salt melt to form a fused state?
At what temperature does salt melt to form a fused state?
About 800 °C
What gas is released at the anode when fused salt is electrolyzed?
What gas is released at the anode when fused salt is electrolyzed?
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What is the compound formed in the cell during the production of chlorine gas using the electrolysis of brine?
What is the compound formed in the cell during the production of chlorine gas using the electrolysis of brine?
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What is the pH value of the aqueous solution of sodium chloride (table salt)?
What is the pH value of the aqueous solution of sodium chloride (table salt)?
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How can you determine if a substance is acidic, basic, or neutral?
How can you determine if a substance is acidic, basic, or neutral?
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List substances in day-to-day use according to their pH values from 1 to 14.
List substances in day-to-day use according to their pH values from 1 to 14.
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How is common salt (sodium chloride) formed? What reaction leads to its creation?
How is common salt (sodium chloride) formed? What reaction leads to its creation?
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What are some properties of common salt (sodium chloride)?
What are some properties of common salt (sodium chloride)?
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Study Notes
Electrolysis of Sodium Chloride Solutions
- At the cathode, hydrogen gas is released when an electric current is passed through a saturated sodium chloride solution.
- At the anode, chlorine gas is released during the electrolysis of a saturated sodium chloride solution.
Physical Properties of Sodium Chloride
- Sodium chloride melts at approximately 801°C to form a fused state.
Electrolysis of Fused Salt
- When fused sodium chloride is electrolyzed, chlorine gas is generated at the anode.
Electrolysis of Brine
- The compound formed during the production of chlorine gas from the electrolysis of brine is sodium hydroxide (NaOH).
pH of Sodium Chloride Solution
- Aqueous solutions of sodium chloride (table salt) typically have a pH close to 7, indicating neutrality.
Determining pH Levels
- The acidity, basicity, or neutrality of a substance can be determined using pH indicators or pH meters.
Substances and Their pH Values
- pH 1: Battery acid
- pH 2: Lemon juice
- pH 3: Vinegar
- pH 4: Tomato juice
- pH 5: Coffee
- pH 6: Milk
- pH 7: Pure water (neutral)
- pH 8: Sea water
- pH 9: Baking soda solution
- pH 10: Soapy water
- pH 11: Ammonia solution
- pH 12: Hair conditioner
- pH 13: Bleach
- pH 14: Drain cleaner
Formation of Common Salt
- Common salt (sodium chloride) is formed by the reaction of sodium (Na) with chlorine (Cl) through an ionic bond.
- The reaction is represented by the equation: Na + Cl2 → 2 NaCl.
Properties of Common Salt
- Sodium chloride is a white crystalline solid, highly soluble in water, and possesses a characteristic salty taste.
- It has a high melting point and is an essential mineral for biological processes.
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Description
Test your knowledge on the pH scale and acidity levels with this quiz. Questions include identifying substances, determining acidity or basicity, and listing everyday substances based on their pH values.
