Barium Hydroxide in Acid-Alkali Titration

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How can barium hydroxide solutions be kept free from carbonates?

Absorb carbon dioxide using soda-lime absorption tubes

Precipitate absorbed carbon dioxide as insoluble barium carbonate (correct)

Standardize against normal sodium hydroxide solution

Standardize titrimetrically against sodium carbonate

How should alkali solutions be prepared to ensure they are free from carbon dioxide?

Protect from carbon dioxide using soda-lime absorption tubes (correct)

Standardize against pure sodium carbonate

Standardize gravimetrically by precipitation of silver chloride

Standardize titrimetrically against normal hydrochloric acid solution

What is a suitable method for standardizing alkali solutions like sodium hydroxide or potassium hydroxide?

Titration against sodium carbonate with phenolphthalein as an indicator

Using a standard solution of hydrochloric or sulphuric acid as a primary standard (correct)

Precipitating an equivalent amount of silver chloride

Standardizing against pure sodium carbonate

How is the standardization of sulfuric acid solution typically done?

By titration against sodium carbonate or normal sodium hydroxide solution Signup and view all the answers

What is a primary standard that can be used to standardize alkali solutions?

Potassium biphthalate Signup and view all the answers

Why should all alkali solutions be re-standardized frequently?

To ensure their accuracy over time Signup and view all the answers

What is the purpose of using an indicator in a titration process?

To indicate when equivalent quantities of analyte and titrant have reacted Signup and view all the answers

Why is it crucial to use carbon dioxide-free water in the preparation of 1N NaOH?

To prevent the formation of carbonates in sodium hydroxide caused by carbon dioxide Signup and view all the answers

What does a primary standard refer to in the context of this text?

Complex organic compounds used for standardization Signup and view all the answers

How is phenolphthalein used as an indicator in titrations?

It turns pink at a slightly basic pH Signup and view all the answers

What is the endpoint observed when phenolphthalein is used as an indicator in neutralization reactions?

Faint pink Signup and view all the answers

Why should sodium hydroxide pellets be dissolved in carbon dioxide-free water?

To avoid forming carbonates in sodium hydroxide due to carbon dioxide Signup and view all the answers

What is the formula used for calculating the weight percentage of a substance?

V x NF x Titer x 100 Signup and view all the answers

Which standard alkali solutions are commonly used in acidimetry and alkalimetry?

Sodium hydroxide, potassium hydroxide, and barium hydroxide Signup and view all the answers

In which type of titration is hydrochloric acid preferable over sulfuric acid?

In titrations where a precipitate is formed Signup and view all the answers

What happens to standard alkali solutions like sodium hydroxide and potassium hydroxide over time?

They absorb carbon dioxide and may be contaminated with carbonates Signup and view all the answers

Why is sulfuric acid preferable over hydrochloric acid in hot titrations?

There is no danger of loss due to volatilization Signup and view all the answers

What may impair the usefulness of standard alkali solutions?

Absorption of carbon dioxide and contamination with carbonates Signup and view all the answers

Barium Hydroxide in Acid-Alkali Titration

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