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Module 6 - Acids and Bases > Enthalpy of Neutralisation > Flashcards

Enthalpy of Neutralisation Flashcards

1
Q

What is calorimetry?

A

Calorimetry is the process by which the energy change of a reaction is measured using water as a medium.

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2
Q

Is neutralisation exo or endo?

A

Exothermic

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2
Q

Is neutralisation exo or endo?

A

Exothermic

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3
Q

What is the assumption that is made often in neutralisation?

A

delta H reaction = -delta H water
- The chemical reaction releases energy, the water absorbs energy and vice versa.

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4
Q

What is the common mistake?

A

Total volume
50mL + 50mL = 100mL

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5
Q

What is one thing that will strengthen your responses in Trials?

A

Diagrams + flowcharts

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6
Q

What do thermometers measure?

A

Thermometers measure the average particle energy.

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7
Q

What do thermometers measure?

A

Thermometers measure the average particle energy.

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8
Q

How does temp relate to enthalpy?

A

Enthalpy is the total internal energy in a system. Combine temp with the amount of particles (mass) and how well they absorb energy (shc), you get total energy.

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9
Q

What does shc?

A

Specific Heat Capacity

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10
Q

What formula do you use to calculate the enthalpy of water/reaction?

A

delta H = mCat equation

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11
Q

What is another common yr 12 mistake?

A

Dropping sig fig
check out alan wong’s msg about sig fig

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12
Q

When doing an enthalpy of neutralisation, check if there is a limiting reagent.

A

True -

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13
Q

What does identical solns mean?

A

HSC Wording - same volume + same initial temp

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14
Q

Do not say neutral soln. It is a neutralisation

A

Very common yr 12 mistake

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15
Q

What is the structure to find the enthalpy of neutralization?

A
  1. Chemical equation (balanced)
  2. Mcat equation
  3. Find out how much energy is lost (formula 2)
  4. How many moles n=cV
  5. Final cal.
16
Q

What is the important formula to remember?

A

delta H reaction = -delta H water (assumption)

17
Q

How do you find the limiting reagent?

A
  1. Balanced chemical equation
  2. Number of moles of species
  3. Check which one has less moles, taking into account the molar ratio
18
Q

What is the volume of the species added at pH =7?

A

sample:
n(HCl) = n(NaOH) = 0.056mol
C= n/v = 0.056/(1.4) = 0.040L
where 1.4 mol/L is the concentration of NaOH

19
Q

What is the final pH of a solution after the entire mixture is poured in?

A
  1. Find the moles in excess & convert into concentration
  2. Make sure to divide it on top of the total volume of the mixture
  3. Calculate the POH/pH depending on its presence in the reaction

Module 6 - Acids and Bases (6 decks)

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