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The acid and the base are used to remove all the other "stuff" from the sample, and leave only the fiber. There are challenges in that when we remove the sugar and starch (acid hydrolysis), and the protein and carbohydrates (the base hydrolysis), we should have just fiber left. But some of the fiber is lost to the two-stage chemical hydrolysis we just ran the sample through. We are then left with the challenge of making an estimate (the "determination") of the crude fiber based on what we know about the sample, about the procedure and about the quantity of the fiber we observe at the end of the chemical processes.

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Q: Why are sulfuric acid and sodium hydroxide needed in crude fiber determination?
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Related questions

What is the symbol equation for sulfuric acid reacts with sodium hydroxide?

H2SO4 + 2 NaOH --> Na2SO4 + 2 H2O. Sulfuric Acid + Sodium Hydroxide --> Sodium Sulfate + Water.


Why is the reaction of calcium hydroxide and sulfuric acid different from sodium hydroxide and sulfuric acid?

The reactions of sodium hydroxide and calcium hydroxide with sulfuric acid will produce sodium sulfate and calcium sulfate respectively (water will be another product in both reactions. Sodium sulfate is soluble in water and so will remain in solution. Calcium sulfate, however, is insoluble and will precipitate as a solid.


Which chemical is a strong acid Sodium hydroxide sulfuric acid calcium hydroxide or potassium hydroxide?

sulphuric acid


Can lactic acid sodium hydroxide and sulfuric acid be mixed together?

yes but sodium hydroxide will be neutralized by one or both acids


Which would you say is more corrosive of concentrated sulfuric acid and concentrated sodium hydroxide solution?

They are not comparable. Sulfuric acid is corrosive to some other material then Sodium hydroxide and vice verse.


Is it preferable to pour concentrated sodium hydroxide over sulfuric acid spilled on the floor?

No. The reaction of sodium hydroxide with sulfuric is more exothermic. And hence it is preferred to pour a solution of sodium bicarbonate or potassium bicarbonate in the case of spills.


What is the formula when combining sodium hydroxide and sulfuric acid?

Na2SO4 and H2O


What is the purpose of titrating sodium hydroxide with an acid solution?

Determination of the concentration of sodium hydroxide in solution with the help of a neutralization reaction.


What is the chemical equation for the reaction between sulfuric acid with sodium hydroxide?

Sulfuric acid plus sodium hydroxide gives sodium sulfate plus water.


Can you name some Acids and Hydroxides?

Hydrochloric acid Sulfuric acid Phosphoric acid Sodium hydroxide Calcium hydroxide Potassium hydroxide


When Dissolved sodium hydroxide reacts with sulfuric acid aqueous sodium water and heat are formed?

That sounds right.


What substances do you get if you mix sodium hydroxide and sulfuric acid?

acid + base = salt + water