WEEK 8 TERM 1 CHEMISTRY SABIS GRADE 11 QUIZ

Question 1 - Calculate [H+] and [OH-]

Calculate [H⁺] and [OH^-] in 250.0 mL of a 0.400 M H₂SO₄ solution, assuming the acid is strong. Give your answer in scientific notation to three significant figures.

a) [H⁺] = M

b) [OH^-] = × 10^-14 M

Question 2:

(i) Calculate the concentration of hydrogen ions, [H⁺], in the solution: (Give your answer to two sig. figures)

[H⁺] = M

(ii) Deduce the pH of the solution (Give your answer to two decimal places):

pH =

Question 3: Classify each pH range with its description

Drag and drop the correct item to label each zone on the pH scale, used to classify aqueous solutions.

Zone A (0-6): Acidic Basic Neutral

Zone B (7): Acidic Basic Neutral

Zone C (8-14): Acidic Basic Neutral

Question 4 - Calculate [OH-] given pH of solution

A hydrochloric acid solution HCl was found to have a pH = 5.00 at 25°C.

Calculate the concentration of OH-.

Give your answer in scientific notation to three significant figures.

The concentration of OH^- ions in it is × 10^ M

Question 5:

Choose the correct item to complete the following:

When a few mL of a dilute hydrochloric acid solution, HCl, are added onto a sample of solid sodium carbonate Na₂CO₃, the following is observed:

a) Effervescence Evaporation Burning

b) CO₂ H₂ O₂ Cl₂

Question 6: Fill in the blanks for the pH calculation:

A solution is prepared by dissolving 0.00400 mol of the strong acid HCl in a 400 mL volumetric flask, filled up to the calibration mark.

Fill in the blanks:

Give your answer to three decimal places.

The pH of this solution at 25°C will be M

Question 7: Fill in with the correct answer.

An acid-base indicator is a dye whose color is sensitive to the change of _______.

Question 8: Choose the correct color for each statement:

Drag and drop the word from the box below to fill in the blanks:

a- Wet litmus paper is _______ in an acidic solution. colorless red yellow blue

b- Wet litmus paper is _______ in a basic solution. colorless red yellow blue

Question 9: Select the correct color of phenolphthalein in basic and acidic medium.

Phenolphthalein in acidic medium is:

Colorless Pink Purple

Phenolphthalein in basic medium is:

Colorless Pink Purple

Question 10: Calculate the volume of the base added in an acid-base titration.

What is the correct formula to calculate the volume of the base added in an acid-base titration?

Last reading of burette - First reading of burette
First reading of burette + Last reading of burette
First reading of burette - Last reading of burette
Last reading of burette * First reading of burette

Question 11: What is the color of methyl orange in acidic medium?

Enter your answer:

Question 12: What is the color of methyl orange in basic medium?

Enter your answer:

Question 13: What is pH paper used to measure?

Concentration
Temperature
Approximate pH
Volume
Exact pH

Question 14: Match the terms related to acid dissociation:

(...) acid (...) dissociates in water producing H+ ions and negative ions, it has a (...) dissociation constant like HCl --> to H+ + Cl-

Choose the correct acid: Strong Weak dissociates in water producing: H+ ions and Cl- ions H+ ions and negative ions and it has a: Large Small  dissociation constant.