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Weak Acids and Bases

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Questions and Answers

What is a hydrogen ion?

An electron
An atom
A proton (correct)
A proton and an electron

Which of the following statements is true about the pH scale?

The lower the pH, the stronger the base
The higher the pH, the stronger the acid (correct)
A pH of 7 is acidic
The pH scale ranges from 0-14

What happens to a strong acid like HCl when mixed with water?

It becomes neutral
It becomes a weak base
It dissociates into hydrogen ions and chloride ions (correct)
It loses its acidity

How does a strong base differ from a weak base in terms of dissociation?

Strong bases dissociate more completely than weak bases (B) Signup and view all the answers

What does a substance with a low pH indicate?

It is a strong acid (C) Signup and view all the answers

What defines an acid according to its behavior in water?

It donates hydrogen ions (B) Signup and view all the answers

Which ion characterizes a hydrogen ion (proton)?

$H^+$ (D) Signup and view all the answers

What is the difference between a strong acid and a weak acid?

Strong acids dissociate more easily than weak acids. (D) Signup and view all the answers

How is the acidity constant (Ka) helpful in measuring an acid's ability to donate a hydrogen ion?

Ka shows how likely a substance is to donate a hydrogen ion. (D) Signup and view all the answers

How is pKa calculated and what does a lower pKa value indicate?

pKa is calculated by taking the negative log of Ka; a lower pKa indicates a stronger acid. (D) Signup and view all the answers

What happens when an acid donates a proton?

It becomes a conjugate base. (A) Signup and view all the answers

Which of the following is NOT a strong acid?

(CH3CH2)2NH - Diethylamine (D) Signup and view all the answers

What differentiates strong bases from weak bases?

Weak bases do not dissociate completely like strong bases. (A) Signup and view all the answers

Why is it important to differentiate between strong and weak acids and bases?

To understand their effect on blood pH regulation. (D) Signup and view all the answers

"Buffer" solutions play a key role in maintaining blood pH stability. What is the function of buffers?

Buffers prevent rapid changes in pH by absorbing excess H+ or OH- ions. (D) Signup and view all the answers

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