What is the major disadvantage of using concentrated sulfuric acid rather than 85% phosphoric acid for the dehydration of alcohols?

What is the major disadvantage of using concentrated sulfuric acid or HCl rather than 85% phosphoric acid for the dehydration of alcohols? Concentrated sulfuric acid tends to protonate the alkene product, leading to polymerization of the product. … Both of these gases have to be removed from the alkene.

Why is sulfuric acid better than phosphoric acid?

Sulfuric acid is a strong acid, whereas phosphoric acid is a weak acid. In turn, the strength of an acid can determine the way in which a titration occurs. Strong acids can be used to titrate a weak or strong base.

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Why is phosphoric acid preferred over sulfuric acid for dehydration of alcohols?

Phosphoric(V) acid tends to be used in place of sulphuric acid because it is safer and produces a less messy reaction. Phosphoric(V) acid isn’t a strong oxidising agent. You have to be wary with more complicated alcohols in case there is the possibility of more than one alkene being formed.

Why do we use concentrated sulfuric acid rather than another acid catalyst concentrated HCl concentrated phosphoric acid )?

Phosphoric(V) acid tends to be used instead of sulfuric acid because it is safer and facilitates a less complex reaction.

Why does the dehydration of an alcohol more often use concentrated sulfuric acid H2SO4 as the acid catalyst rather than dilute hydrochloric acid HCl?

Why does the dehydration of an alcohol more often use concentrated sulfuric acid, H2SO4, as the acid catalyst rather than dilute hydrochloric acid, HCI? … Only acids with more than one proton can complete the dehydration reaction The presence of the chloride ion could result in a competing substitution reaction.

Is phosphoric or sulfuric acid stronger?

Based on pKa, sulfuric acid is the strongest acid. The smaller the pKa value the stronger the acid. All of the pKa values for sulfuric acid are less than those of phosphoric acid, hence sulfuric acid is the strongest acid.

What is the strongest acid on earth?

Fluoroantimonic acid is the strongest super-acid known in existence. It is 20 quintillion times more acidic than 100% sulfuric acid, and it can dissolve glass plus a host of other substances.

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Which alcohol can be oxidised by acidified potassium dichromate VI but Cannot be dehydrated?

(h) Draw the structure of the isomer of A that cannot be dehydrated to form an alkene by reaction with concentrated sulfuric acid. Ethanol can be oxidised by acidified potassium dichromate(VI) to ethanoic acid in a two-step process.

Which alcohol will not react with potassium dichromate VI in sulfuric acid?

Tertiary alcohols are not oxidized by acidified sodium or potassium dichromate(VI) solution – there is no reaction whatsoever.

Which alcohol can be oxidised but not dehydrated?

Ethanol is the alcohol that can be oxidised by acidified potassium dichromate but cannot be dehydrated.

Why was concentrated sulfuric acid used and not dilute acid?

In concentrated sulfuric acid there is little to no water (note that we also start off with little to no ethylene). The equilibrium shifts to produce products. In dilute sulfuric acid there is lots of water (and little to no ethanol). The equilibrium shifts to produce reactants.

What is the purpose of concentrated Sulphuric acid?

In addition to being an oxidizing agent, reacting readily at high temperatures with many metals, carbon, sulfur, and other substances, concentrated sulfuric acid is also a strong dehydrating agent, combining violently with water; in this capacity, it chars many organic materials, such as wood, paper, or sugar, leaving …

What would be the major disadvantage of using concentrated sulfuric acid rather than?

What is the major disadvantage of using concentrated sulfuric acid or HCl rather than 85% phosphoric acid for the dehydration of alcohols? Concentrated sulfuric acid tends to protonate the alkene product, leading to polymerization of the product. … Concentrated sulphuric acid produces messy results.

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What is the difference between concentrated and dilute sulfuric acid?

A concentrated acid is an acid which is in either pure form or has a high concentration. … A dilute acid is that in which the concentration of the water mixed in the acid is higher than the concentration of the acid itself. For instance, 5% sulfuric acid is a dilute acid.

What is the function of sulfuric acid in the hydration of norbornene?

In the Acid-Catalyzed Hydration of norbornene, water and sulfuric acid were added to the C=C double bond to form norborneol. Sulfuric acid acted as a catalyst, where it was not consumed in the reaction and helped to propel the reaction forward, as it was vital in forming hydronium ion and breaking the double bond.

Is dilute sulfuric acid a dehydrating agent?

As well as being a strong acid, sulfuric acid is also a dehydrating agent, meaning it is very good at removing water from other substances.

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