IGCSE CHEMISTRY: ACIDS & SALTS.
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State the steps for calculating empirical formula - Answer: 1) mass/Aᵣ. 2) divide by the
smallest. 3) Give the ratio has a whole number. 4) State final empirial formula
State the formula for the copper (II) ion - Answer: Cu²⁺
State the formula for the iron (II) ion - Answer: Fe²⁺
State the formula for the iron (III) ion - Answer: Fe³⁺
State the formula for the lead (II) ion - Answer: Pb²⁺
State the formula of the hydrogen ion - Answer: H⁺
State the formula of the ammonium ion - Answer: NH₄⁺
State the formula of the carbonate ion - Answer: CO₃²⁻
State the formula of the hydroxide ion - Answer: OH⁻
State the formula of the nitrate ion - Answer: NO₃⁻
State the formula of the silver ion - Answer: Ag⁺
State the formula of the sulfate ion - Answer: SO₄²⁻
State the formula of the zinc ion - Answer: Zn²⁺
What is the ph of a neutral solution? - Answer: 7
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, What is the ph of a strong acid? - Answer: 0-3
What is the universal indicator colour of a neutral solution? - Answer: Green
What is the universal indicator colour of a ph 0-3 solution? - Answer: Red
What is the universal indicator colour of a ph 11-14 solution? - Answer: Purple
What is an acid? - Answer: An acid is a source of hydrogen ions, H⁺
What is an alkali? - Answer: An alkali is a source of hydroxide ions, OH⁻
What is a base? - Answer: A substance which can neutralise an acid, forming salt and
water only
State the solubility rule for carbonates salts - Answer: all carbonates are insoluble,
except those of sodium, potassium and ammonium
State the solubility rule for chloride salts - Answer: all are soluble, except silver chloride
and lead chloride
State the solubility rule for nitrate salts - Answer: all nitrates are soluble
State the solubility rule for sodium, potassium and ammonium salts - Answer: all
common sodium, potassium and ammonium salts are soluble
State the solubility rule for sulfate salts - Answer: all sulfates are soluble, except those
of lead, barium and calcium
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
Trusted by students across multiple disciplines!
State the steps for calculating empirical formula - Answer: 1) mass/Aᵣ. 2) divide by the
smallest. 3) Give the ratio has a whole number. 4) State final empirial formula
State the formula for the copper (II) ion - Answer: Cu²⁺
State the formula for the iron (II) ion - Answer: Fe²⁺
State the formula for the iron (III) ion - Answer: Fe³⁺
State the formula for the lead (II) ion - Answer: Pb²⁺
State the formula of the hydrogen ion - Answer: H⁺
State the formula of the ammonium ion - Answer: NH₄⁺
State the formula of the carbonate ion - Answer: CO₃²⁻
State the formula of the hydroxide ion - Answer: OH⁻
State the formula of the nitrate ion - Answer: NO₃⁻
State the formula of the silver ion - Answer: Ag⁺
State the formula of the sulfate ion - Answer: SO₄²⁻
State the formula of the zinc ion - Answer: Zn²⁺
What is the ph of a neutral solution? - Answer: 7
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, What is the ph of a strong acid? - Answer: 0-3
What is the universal indicator colour of a neutral solution? - Answer: Green
What is the universal indicator colour of a ph 0-3 solution? - Answer: Red
What is the universal indicator colour of a ph 11-14 solution? - Answer: Purple
What is an acid? - Answer: An acid is a source of hydrogen ions, H⁺
What is an alkali? - Answer: An alkali is a source of hydroxide ions, OH⁻
What is a base? - Answer: A substance which can neutralise an acid, forming salt and
water only
State the solubility rule for carbonates salts - Answer: all carbonates are insoluble,
except those of sodium, potassium and ammonium
State the solubility rule for chloride salts - Answer: all are soluble, except silver chloride
and lead chloride
State the solubility rule for nitrate salts - Answer: all nitrates are soluble
State the solubility rule for sodium, potassium and ammonium salts - Answer: all
common sodium, potassium and ammonium salts are soluble
State the solubility rule for sulfate salts - Answer: all sulfates are soluble, except those
of lead, barium and calcium
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
