Chemistry: Crystallisation and pH Scale Quiz

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Questions and Answers

In the reaction HCl + NaOH -> H2O + NaCl, what is the mole ratio of NaOH to HCl?

2:1
1:2
2:2
1:1 (correct)

What is the volume of 20/1000 expressed in dm^3?

0.002 dm^3
0.02 dm^3 (correct)
0.20 dm^3
0.025 dm^3

How many moles of NaOH are there if the volume is 0.02 dm^3 and concentration is 0.5 mol/dm^3?

0.01 moles (correct)
0.015 moles
0.1 moles
0.005 moles

What is the concentration if there are 0.01 moles of HCl in a volume of 0.025 dm^3?

0.4 mol/dm^3 (B) Signup and view all the answers

Which type of acid is known to be completely ionized in aqueous solution?

Strong acids (D) Signup and view all the answers

What happens to the pH of a solution as the acid strength increases?

pH decreases (A) Signup and view all the answers

Which acid exhibits partial ionization in aqueous solution?

Citric acid (D) Signup and view all the answers

"Stronger an acid, lower the pH" is a general rule because ________________.

"Strong acids" have higher H+ concentration (B) Signup and view all the answers

For a given concentration of aqueous solutions, what happens to the H+ concentration as pH decreases by one unit?

H+ concentration increases by a factor of 10 (A) Signup and view all the answers

Match the following equations with their correct mole ratio:

HCl + NaOH -> H2O + NaCl = 1:1 ratio of moles of NaOH to moles of HCl H2SO4 + KOH -> H2O + K2SO4 = 1:2 ratio of moles of KOH to moles of H2SO4 CH3COOH + NaOH -> CH3COONa + H2O = 1:1 ratio of moles of NaOH to moles of CH3COOH HNO3 + Ca(OH)2 -> Ca(NO3)2 + H2O = 1:2 ratio of moles of Ca(OH)2 to moles of HNO3 Signup and view all the answers

Match the following terms with their correct definitions:

Strong acid = Completely ionized in aqueous solution Weak acid = Partially ionized in aqueous solution pH decrease by one unit = H+ concentration of the solution increases by a factor of 10 Moles of NaOH = Volume x Concentration Signup and view all the answers

Match the following acids with their appropriate classifications:

Hydrochloric acid = Strong acid Citric acid = Weak acid Sulfuric acid = Strong acid Carbonic acid = Weak acid Signup and view all the answers

Match the following statements with the correct explanations:

Stronger an acid, lower the pH = As acid strength increases, pH decreases pH decrease by one unit leads to H+ concentration increase by factor 10 = Relationship between pH and H+ concentration in solution Strong acid completely ionized in aqueous solution = Characteristic of acids like hydrochloric and nitric acids Weak acid partially ionized in aqueous solution = Characteristic of acids like citric and carbonic acids Signup and view all the answers