Titration and Gas Volume

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What is formula for moles in a solution and what units?
Concentration (moldm^-3) x volume (dm^3)
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What is definition of concentration?
The number of moles of solute dissolve in one dm^3 of solution
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How do you convert from cm^3 to dm^3?
Divide by 1000 (or multiply by 1 x 10^-3)
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What is the formula of concentration when you are given the mass of the solute and the volume?
moles = mass/Mr, then concentration = moles/volume (dm^3)
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How do you convert concentration in moldm^-3 to gdm^-3?
Multiply concentration in moldm^-3 by the Mr
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What do acid-base titrations allow us to work out?
The concentration of the substance NOT in excess (one in the burette)
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What equipment do you need for an acid-base titration?
Burette, pipette, conical flask, stand and clamp, white tile
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What do you rinse the burette with before a titration?
Water then acid
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What do you rinse the conical flask with before a titration?
Water
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What do you pre rinse the pipette with before a titration?
Alkali (base)
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What indicator do we use in a titration?
Phenolphthalein
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When do we stop adding the base to the acid?
When the solution in the conical flask has turned colourless
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Where on the burette do we take a reading for the volume of acid used?
The meniscus of the liquid
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What is the used of the white tile?
To see the colour change easier
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What do we do before we take any serious reading for the titre?
A rough titration
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When do we stop doing titrations?
When we have two concordant (within 0.1 cm^3 of each other) titres
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What do we never use for mean titre?
The result of the rough/trial titre
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To what degree do we calculate the mean titre?
One decimal place
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What else can you find out from titrations?
Molar mass of acid, molar mass of carbonate, and water of crystallisation in a carbonate
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What is room temperature and pressure?
298K and 100kPa
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How much room does one mole of any gas occupy at room room temperature and pressure, and what is the volume known as?
24dm^3 and the molar volume of a gas
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What is the equation for no. of moles of a gas at RTP?
moles = volume in dm^3/24
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When conditions are not RTP what equation do we use and what is it called?
pV=nRT and the Ideal Gas Equation
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What does each letter stand for in the ideal gas equation and what are the units?
p = pressure (Pa) V = volume (m^3) n = Moles of gas R = ideal gas constant (8.314) T = temperature (K)
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How do you convert from cm^3 to m^3?
Multiply by 10^-6 (divide by 1,000,000)
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How do you convert from dm^3 to m^3?
Multiply by 10^-3 (divide by 1,000)
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How do you convert from degrees celsius to Kelvin?
add 273
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How do you convert from kPa to Pa
multiply by 10^3 (multiply by 1,000)
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Other cards in this set

Card 2

Front

What is definition of concentration?

Back

The number of moles of solute dissolve in one dm^3 of solution

Card 3

Front

How do you convert from cm^3 to dm^3?

Back

Preview of the front of card 3

Card 4

Front

What is the formula of concentration when you are given the mass of the solute and the volume?

Back

Preview of the front of card 4

Card 5

Front

How do you convert concentration in moldm^-3 to gdm^-3?

Back

Preview of the front of card 5
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