Question:
Sodium hydroxide is used as cooking chemical in ____pulping process.
Sodium hydroxide is used as cooking chemical in ____pulping process.
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NaOH is a strong base. Basic = Alkaline. This logic applies to most chemistry and wood-pulping questions.
Updated On: Aug 7, 2026
- Acidic
- Semi chemical
- Alkaline
- Mechanical
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
This question asks to classify a paper pulping method based on the chemical nature of the "cooking liquor" used to dissolve lignin.
Detailed Explanation:
• Pulping is the process of breaking wood down into fibers suitable for papermaking.
• Chemical pulping involves "cooking" wood chips in a solution to dissolve the lignin that binds fibers together.
• If the chemical used is Sodium Hydroxide (NaOH), the pH of the solution is very high ($>$ 7), making it an Alkaline process.
• The two main alkaline processes are:
- Soda Process: Uses only NaOH.
- Kraft Process: Uses NaOH and Sodium Sulphide (Na$_2$S).
• Alkaline processes are preferred because they produce stronger fibers and can handle a wider range of wood species compared to acidic processes (like the Sulphite process).
Step 2: Final Answer:
Sodium hydroxide is the primary chemical in Alkaline pulping.
This question asks to classify a paper pulping method based on the chemical nature of the "cooking liquor" used to dissolve lignin.
Detailed Explanation:
• Pulping is the process of breaking wood down into fibers suitable for papermaking.
• Chemical pulping involves "cooking" wood chips in a solution to dissolve the lignin that binds fibers together.
• If the chemical used is Sodium Hydroxide (NaOH), the pH of the solution is very high ($>$ 7), making it an Alkaline process.
• The two main alkaline processes are:
- Soda Process: Uses only NaOH.
- Kraft Process: Uses NaOH and Sodium Sulphide (Na$_2$S).
• Alkaline processes are preferred because they produce stronger fibers and can handle a wider range of wood species compared to acidic processes (like the Sulphite process).
Step 2: Final Answer:
Sodium hydroxide is the primary chemical in Alkaline pulping.
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