Titration and Gas Volume 0.0 / 5 ? ChemistryAcids, bases and saltsASOCR Created by: RIPClubPenguinCreated on: 13-04-17 11:37 What is formula for moles in a solution and what units? Concentration (moldm^-3) x volume (dm^3) 1 of 28 What is definition of concentration? The number of moles of solute dissolve in one dm^3 of solution 2 of 28 How do you convert from cm^3 to dm^3? Divide by 1000 (or multiply by 1 x 10^-3) 3 of 28 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) 4 of 28 How do you convert concentration in moldm^-3 to gdm^-3? Multiply concentration in moldm^-3 by the Mr 5 of 28 What do acid-base titrations allow us to work out? The concentration of the substance NOT in excess (one in the burette) 6 of 28 What equipment do you need for an acid-base titration? Burette, pipette, conical flask, stand and clamp, white tile 7 of 28 What do you rinse the burette with before a titration? Water then acid 8 of 28 What do you rinse the conical flask with before a titration? Water 9 of 28 What do you pre rinse the pipette with before a titration? Alkali (base) 10 of 28 What indicator do we use in a titration? Phenolphthalein 11 of 28 When do we stop adding the base to the acid? When the solution in the conical flask has turned colourless 12 of 28 Where on the burette do we take a reading for the volume of acid used? The meniscus of the liquid 13 of 28 What is the used of the white tile? To see the colour change easier 14 of 28 What do we do before we take any serious reading for the titre? A rough titration 15 of 28 When do we stop doing titrations? When we have two concordant (within 0.1 cm^3 of each other) titres 16 of 28 What do we never use for mean titre? The result of the rough/trial titre 17 of 28 To what degree do we calculate the mean titre? One decimal place 18 of 28 What else can you find out from titrations? Molar mass of acid, molar mass of carbonate, and water of crystallisation in a carbonate 19 of 28 What is room temperature and pressure? 298K and 100kPa 20 of 28 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 21 of 28 What is the equation for no. of moles of a gas at RTP? moles = volume in dm^3/24 22 of 28 When conditions are not RTP what equation do we use and what is it called? pV=nRT and the Ideal Gas Equation 23 of 28 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) 24 of 28 How do you convert from cm^3 to m^3? Multiply by 10^-6 (divide by 1,000,000) 25 of 28 How do you convert from dm^3 to m^3? Multiply by 10^-3 (divide by 1,000) 26 of 28 How do you convert from degrees celsius to Kelvin? add 273 27 of 28 How do you convert from kPa to Pa multiply by 10^3 (multiply by 1,000) 28 of 28
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