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In Chemistry, a pH scale is used to measure the acidity or basicity of aqueous or other liquid solutions. In this context, arrange the following in decreasing order of pH.
Lemon Juice
  • Milk of Magnesia
  • Caustic Soda
    Select the correct answer using the code given below.
    • a)
      3-1-2
    • b)
      3-2-1
    • c)
      2-1-3
    • d)
      1-2-3
    Correct answer is option 'B'. Can you explain this answer?
    Most Upvoted Answer
    In Chemistry, a pH scale is used to measure the acidity or basicity o...
    • pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion—which ordinarily ranges between 0 and 14 on a pH scale.
    • The strength of acids and bases depends on the number of H+ ions and OH– ions produced, respectively. If we take hydrochloric acid and acetic acid of the same concentration, say one molar, then these produce different amounts of hydrogen ions. Acids that give rise to more H+ ions are said to be strong acids, and acids that give less H+ ions are said to be weak acids.
    • Approximate pH values of some common acids and bases are:
      • Lemon juice - 2.2
      • Milk of Magnesia (Magnesium hydroxide) -10
      • Caustic Soda (Sodium Hydroxide) -14
    • Water has a pH of around 7.4.
    • Our body works within the pH range of 7.0 to 7.8. Living organisms can survive only in a narrow range of pH changes. When the pH of rainwater is less than 5.6, it is called acid rain.
    Hence, option (b) is the correct answer.
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    Community Answer
    In Chemistry, a pH scale is used to measure the acidity or basicity o...
    In this question, we are asked to arrange three substances - Lemon Juice, Milk of Magnesia, and Caustic Soda - in decreasing order of pH. The pH scale is used to measure the acidity or basicity of aqueous or liquid solutions, with values ranging from 0 to 14. A pH value less than 7 indicates acidity, a pH value of 7 indicates neutrality, and a pH value greater than 7 indicates basicity.

    Now, let's analyze the pH of each substance:

    1. Lemon Juice:
    Lemon juice is known for its acidic properties due to the presence of citric acid. It has a pH value of around 2, which is quite low on the pH scale. Therefore, lemon juice is highly acidic.

    2. Milk of Magnesia:
    Milk of Magnesia, also known as magnesium hydroxide, is often used as an antacid to neutralize excess stomach acid. It has a pH value of around 10.5, which is significantly higher than lemon juice. Therefore, milk of magnesia is basic or alkaline in nature.

    3. Caustic Soda:
    Caustic soda, also known as sodium hydroxide, is a strong base commonly used in various industrial processes. It has a pH value of around 14, which is the highest value on the pH scale. Therefore, caustic soda is highly basic.

    Based on the above information, we can arrange the substances in decreasing order of pH as follows:

    Lemon Juice (pH 2) > Milk of Magnesia (pH 10.5) > Caustic Soda (pH 14)

    Therefore, the correct answer is option B: 3-2-1.
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    In Chemistry, a pH scale is used to measure the acidity or basicity of aqueous or other liquid solutions. In this context, arrange the following in decreasing order of pH. Lemon Juice Milk of Magnesia Caustic Soda Select the correct answer using the code given below.a)3-1-2b)3-2-1c)2-1-3d)1-2-3Correct answer is option 'B'. Can you explain this answer?
    Question Description
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