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310417-Nat 5 chemistry Unit 1 > Acids and alkali > Flashcards

Flashcards in Acids and alkali Deck (50)
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31

Why do acidic and alkaline solutions conduct electricity well?

They contain oppositely charged ions that are free to move in solution and can carry charge

32

What is the proportion of hydroxide and hydrogen ions in alkaline solution ?

More OH- than H+

33

What happens to the pH and the concentration of an acid when you dilute it?

The pH goes up and concentration of the acid goes down

34

What happens to the pH and the concentration of an alkali when you dilute it?

The pH goes down and concentration of the alkali goes down

35

If a metal oxide is soluble in water what does it produce ?

An alkali

36

If a non metal oxide is soluble in water what does it produce

An acid

37

What does acids contain?

Charged particles called hydrogen ions

38

what is the difference between a base and an alkali

A base is a substance that neutralises an acid
A base that is soluble in an alkali
All alkalis are bases but not all bases are alkalis

39

What is a spectator ion?

It's an ion that exists in the same form on both the reactant and product sides of a chemical reaction

40

what is titration?

an experimental method to determine the concentration of an unknown solution.

41

How to recognise hydrogen? (test for hydrogen?)

Burns with a pop

42

How to recognise oxygen? (test for oxygen)

Relights a glowing splint

43

How to recognise carbon dioxide? (test for carbon dioxide)

Turns lime water cloudy

44

What is the name of a metal oxide that do not dissolve in water but is capable of neutralising an acid?

a base

45

What are the products of this reaction: Hydrochloric acid + potassium carbonate?

potassium chloride + water + carbon dioxide

46

What are the products for this reaction:
Sulfuric acid + Lithium oxide? (write the chemical formula for the salt produced)

Lithium sulfate + water

Salt: Lithium Sulfate, formula: Li2SO4

47

What is the formula for Sodium carbonate?

Na2CO3

48

Formula for Sodium hydroxide (Alkali)

NaOH

49

Write the chemical equation for the neutralisation reaction between Magnesium oxide and Nitric acid

MgO + HNO3 --> Mg(NO3)2 + H2O

50

H2SO4 + 2NaOH

If 20ml of acid of concentration 0.2 mol/l were used to neutralised 25ml sodium hydroxide, what is the concentration of sodium hydroxide?

H2SO4 + 2NaOH

n=0.004 n=0.008
C=0.2 V=0.025
V=0.02 C= 0.32

Concentration of NaOH=0.32mol/l