18 Questions
How can barium hydroxide solutions be kept free from carbonates?
Precipitate absorbed carbon dioxide as insoluble barium carbonate
How should alkali solutions be prepared to ensure they are free from carbon dioxide?
Protect from carbon dioxide using soda-lime absorption tubes
What is a suitable method for standardizing alkali solutions like sodium hydroxide or potassium hydroxide?
Using a standard solution of hydrochloric or sulphuric acid as a primary standard
How is the standardization of sulfuric acid solution typically done?
By titration against sodium carbonate or normal sodium hydroxide solution
What is a primary standard that can be used to standardize alkali solutions?
Potassium biphthalate
Why should all alkali solutions be re-standardized frequently?
To ensure their accuracy over time
What is the purpose of using an indicator in a titration process?
To indicate when equivalent quantities of analyte and titrant have reacted
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
What does a primary standard refer to in the context of this text?
Complex organic compounds used for standardization
How is phenolphthalein used as an indicator in titrations?
It turns pink at a slightly basic pH
What is the endpoint observed when phenolphthalein is used as an indicator in neutralization reactions?
Faint pink
Why should sodium hydroxide pellets be dissolved in carbon dioxide-free water?
To avoid forming carbonates in sodium hydroxide due to carbon dioxide
What is the formula used for calculating the weight percentage of a substance?
V x NF x Titer x 100
Which standard alkali solutions are commonly used in acidimetry and alkalimetry?
Sodium hydroxide, potassium hydroxide, and barium hydroxide
In which type of titration is hydrochloric acid preferable over sulfuric acid?
In titrations where a precipitate is formed
What happens to standard alkali solutions like sodium hydroxide and potassium hydroxide over time?
They absorb carbon dioxide and may be contaminated with carbonates
Why is sulfuric acid preferable over hydrochloric acid in hot titrations?
There is no danger of loss due to volatilization
What may impair the usefulness of standard alkali solutions?
Absorption of carbon dioxide and contamination with carbonates
Learn about the role of barium hydroxide in acid-alkali titration. Discover how barium hydroxide solutions help in removing carbonates from solutions to maintain accurate concentration levels.
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