Extra Stuff Flashcards
1
Q
How to calculate mol when there is a limiting reagent
A
Find the ratio between the two things (if it’s got a two versus three on the left of each symbol it’s 2:3) and find moles of both. Find the limiting by multiplying 3/2 or 2/3 to the 2 or 3. The limiting reagent is the moles of the equation including for example the 3 in 3NaO or smth. Divide it by three in this case to get the mole and get mass by mrmol
2
Q
How do you investigate the solubility of solids in water at different temperatures?
A
- Place a beaker containing 100cm³ of water in a water bath
- Add known masses of solid to the beaker until the solution is saturated
- Filter the solution to remove undissolved solid
- Record the mass of an evaporating basin and calculate the mass of solute that dissolved
- Repeat at different temperatures
3
Q
Why should the beaker be kept in the water bath when carrying out an experiment at a specific temp?
A
To ensure the temp of the water in the beaker is constant throughout the experiment.
Removing the beaker would cause heat to be lost to the surroundings.
