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Hi, I have a chemistry exam on Tuesday. I'm little bit confused as how I could identify whether a substance is an acid, alkaline or salt:
Acid+Alkali-->Salt + water.
Acid+Metal--> Salt+hydrogen.
Acid+metal carbonate--> salt+water+carbondioxide
Acid+metal--> salt+water
How would I know what would be a salt and how do I know which reactant is acid/alkali?
Many thanks
Acid+Alkali-->Salt + water.
Acid+Metal--> Salt+hydrogen.
Acid+metal carbonate--> salt+water+carbondioxide
Acid+metal--> salt+water
How would I know what would be a salt and how do I know which reactant is acid/alkali?
Many thanks
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#2
Do you know what form the reactants will be given in? e.g.
HCl + NaOH -> H2O + NaCl
or
Hydrochlorid acid + Sodium hydroxide -> Water + Sodium chloride
If you're given the names, a lot of acids have "acid" in their name, and a lot of alkalis have "hydroxide".
If you're given formula, you should know 3 main acids, sulfuric acid H2SO4, nitric acid HNO3, and hydrochloric acid HCl. One rough definition is that a lot of acids will only contain non-metals, whereas a lot of alkalis contain metals and non metals e.g. KOH.
This is a really difficult question to answer, and even at higher levels there is no absolute definition of which chemicals are alkalis. I highly doubt at GCSE level they would give you a chemical formula and expect you to work out if it is an acid or alkali.
HCl + NaOH -> H2O + NaCl
or
Hydrochlorid acid + Sodium hydroxide -> Water + Sodium chloride
If you're given the names, a lot of acids have "acid" in their name, and a lot of alkalis have "hydroxide".
If you're given formula, you should know 3 main acids, sulfuric acid H2SO4, nitric acid HNO3, and hydrochloric acid HCl. One rough definition is that a lot of acids will only contain non-metals, whereas a lot of alkalis contain metals and non metals e.g. KOH.
This is a really difficult question to answer, and even at higher levels there is no absolute definition of which chemicals are alkalis. I highly doubt at GCSE level they would give you a chemical formula and expect you to work out if it is an acid or alkali.
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#3
Acids produce H+ ions when added to water, alkalis produce OH- (hydroxide) ions when added to water, so if you have the formulae that can help you decide.
For example, HCl is hydrochloric acid (H+ ion and Cl- ion), and NaOH is sodium hydroxide, an alkali (Na+ ion, OH- ion).
For example, HCl is hydrochloric acid (H+ ion and Cl- ion), and NaOH is sodium hydroxide, an alkali (Na+ ion, OH- ion).
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#4
(Original post by A.J.Rimmer)
Acids produce H+ ions when added to water, alkalis produce OH- (hydroxide) ions when added to water, so if you have the formulae that can help you decide.
For example, HCl is hydrochloric acid (H+ ion and Cl- ion), and NaOH is sodium hydroxide, an alkali (Na+ ion, OH- ion).
Acids produce H+ ions when added to water, alkalis produce OH- (hydroxide) ions when added to water, so if you have the formulae that can help you decide.
For example, HCl is hydrochloric acid (H+ ion and Cl- ion), and NaOH is sodium hydroxide, an alkali (Na+ ion, OH- ion).
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