Chapter 6 Form 4

Halim said "Ph is the measure of concentration of hydrogen ions in aques solution". State the statements whether it is TRUE or FALSE.

• TRUE

• FALSE

The pH of lemon juice falls between 2 and 3, meaning it is

Answer explanation

Lemon is one of example for acid. pH value from 0 to 6 shows it is acidity.

An acid HX with concentration 0.5 mol dm^-3 hydrogen ions, H⁺ , calculate the pH value of HX

• 3

• 0.2

• 0.3

• 0.302

Answer explanation

A NaOH solution has a concentration of 0.001 mol dm^-3 and the pOH of the solution is 3.0. Explain what formula you use to solved this problem and how you solved it

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Answer explanation

If the pH of a solution is 4, choose the correct steps how to calculate the concentration of hydrogen ions H⁺

• 1) Use formula

  pH=-log[H⁺] ,

  2)insert the value

  4=-log[H⁺]

  3) Calculate the H

  [H⁺]=10^-4

  4) [H⁺]=0.0001 mol/L

• 1) Use formula

  pH=-log[OH⁺] ,

  2)insert the value

  4=-log[OH⁺]

  3) Calculate the H

  [OH⁺]=10^-4

  4) [OH⁺]=0.0002 mol/L

• 1) Use formula

  pH=-log[H⁺] ,

  2)insert the value

  4=-log[H⁺]

  3) Calculate the H

  [H⁺]=10^-4

  4) [H⁺]=0.01 mol/L

Determine the molarity of alkali X with pH value 11.0

• 1x10^-3 mol dm^-3

• 1x10^-2 mol dm^-3

• 3 mol dm^-3

• 1x10^-4 mol dm^-3

Answer explanation

which of the following salt is prepared by double decomposition reaction (DDR)

• KCl

• AgNO3

• CaCo3

• NH2SO4

Answer explanation

all carbonate ion is insoluble except for AMNAK (ammonium,sodium and potassium)

state the solubility of BaSO4

Answer explanation

all sulphate ion is soluble except for barium ion,lead (II) ion and calcium ion.

we can use 3 method in preparing the salt. state only 2 method

is (NH4)2C03 insoluble salt?

• True

• False

Answer explanation

all carbonate ion is insoluble except form AMNAK (ammonium,sodium and potassium ion )