Can someone please help me and let me know if these questions and answers are correct? I just need a second opinion…and if there not correct can you help me…please?!?
1.(3). In the Arrhenius definition, an acid is a substance that
a. turns litmus paper from blue to red
b. has a sour taste, and neutralizes bases
c. furnishes hydrogen ions in water solution
d. furnishes hydroxide ions in water solution
e. neutralizes acidic substances
I am stuck on this one, between A, B, and C, any suggestions?
2.(4). Which of the following is produced from the neutralization of an Arrhenius acid with an Arrhenius base?
a. a metal
b. an indicator
c. a salt
d. depends on the acid and base
e. an Arrhenius base
I believe this is C- a salt, is that correct?
3.(9). The higher the pH of a solution,
a. the more acidic it is
b. the greater the concentration of OH- ions
c. the less basic it is
d. the greater the concentration of hydronium ions
e. answers a and c are correct
I put B- the greater the concentration of OH- ions, is that right?
4.(10). If hydronium ions or hydroxide ions are added beyond the buffer capacity, the added excess ions will
a. precipitate
b. neutralize each other
c. have no effect on the pH
d. change the pH
e. form a gas
I believe this is D- change the pH, is that right?
5.(11). What happens at the end point in a titration?
a. the pH of the solution is 7
b. the indicator is most colorful
c. there is an equal amount of acid and base
d. the indicator changes color
e. the pH of the solution drops
I have D- the indicator changes color, is that correct?
6.(13). What salt forms as the result of a mixture of calcium hydroxide and hydrochloric acid?
a. CaCl
b. CaHCl
c. CaCl2
d. CaOH
e. Cl(OH)2
I have C- CaCl2, is that correct?
Thanks so much for the help ;-)
These look ok. The answer to 1 is c.
Sure, I can help you verify the answers to these questions. Let's go through each question one by one:
1. (3) In the Arrhenius definition, an acid is a substance that:
The correct answer is c. furnishes hydrogen ions in water solution. This definition states that an acid donates or furnishes hydrogen ions (H+) in water solution.
2. (4) Which of the following is produced from the neutralization of an Arrhenius acid with an Arrhenius base?
The correct answer is c. a salt. In a neutralization reaction between an acid and a base, the products formed are salt and water.
3. (9) The higher the pH of a solution:
The correct answer is a. the more acidic it is. pH is a measure of acidity or basicity. The lower the pH value, the higher the concentration of hydronium ions (H3O+) and the more acidic the solution.
4. (10) If hydronium ions or hydroxide ions are added beyond the buffer capacity, the added excess ions will:
The correct answer is d. change the pH. A buffer solution resists changes in pH when small amounts of an acid or a base are added. However, if excess hydronium ions or hydroxide ions are added, they can shift the balance between the acidic and basic components of the buffer, resulting in a change in pH.
5. (11) What happens at the end point in a titration?
The correct answer is d. the indicator changes color. The end point in a titration is reached when the stoichiometrically equivalent amounts of acid and base have reacted. This is typically indicated by a color change in the indicator used.
6. (13) What salt forms as the result of a mixture of calcium hydroxide and hydrochloric acid?
The correct answer is c. CaCl2. In this reaction, calcium hydroxide (Ca(OH)2) reacts with hydrochloric acid (HCl) to form calcium chloride (CaCl2).
I hope this helps! Let me know if you have any more questions.