IIT/JEE Chemistry Practice #31: Acids and Bases

The video tutorial covers three main problems related to acids and bases. It begins with an introduction to the problems and suggests reviewing related tutorials. The first problem involves finding the conjugate acid of NH2-, which is ammonia. The second problem focuses on identifying which compound is not a Lewis acid, with SNCL4 being the answer due to its complete octet. The final problem discusses preparing an acidic buffer solution, with ammonium acetate and acetic acid being the correct components. The tutorial emphasizes understanding the properties of acids, bases, and buffer systems.

What is the conjugate acid of NH2-?

• NH2+

• NH4+

• NH-

• NH3

Which of the following is not a Lewis acid?

• AlCl3

• BF3

• BCl2

• SnCl4

What characteristic must a compound have to act as a Lewis acid?

• It must accept an electron pair.

• It must donate a proton.

• It must be a strong acid.

• It must have a complete octet.

Which combination will not form an acidic buffer solution?

• Sulfuric acid and sodium sulfate

• Ammonium acetate and acetic acid

• Sodium chloride and sodium hydroxide

• Ammonium chloride and ammonium hydroxide

Why does ammonium chloride and ammonium hydroxide not form an acidic buffer?

• Because ammonium ion is a strong acid

• Because they are both weak acids

• Because hydroxide is a strong base

• Because they are not conjugate pairs