Why I couldn't get the results?
I probably contaminated the solution when I placed the uncleaned pipette into the fixed volumetric flask, in an attempt to rinse my pipette with the solution.
Tuesday, January 26, 2010
26/1/2010
4. I learnt that the volume of the solution does not increase as the solid dissolves in it. (I'm still not sure why)
3. I learnt how to use graphical illustrations to determine the equivalence point.
2. I learnt the terms "titrant" and "aliquot".
1. I understood what the first contraction and second contraction meant. (example 24)
2. I need more practices regarding the use of the empirical formula table to solve questions (i.e. when to use it and how to use it)
1. I'm not sure why the volume of solution does not increase as the solid dissolves in it.
1. Today's tutorial was rather fast. I didn't have time to think about the current question and we're moving on to the next problem already. :(
3. I learnt how to use graphical illustrations to determine the equivalence point.
2. I learnt the terms "titrant" and "aliquot".
1. I understood what the first contraction and second contraction meant. (example 24)
2. I need more practices regarding the use of the empirical formula table to solve questions (i.e. when to use it and how to use it)
1. I'm not sure why the volume of solution does not increase as the solid dissolves in it.
1. Today's tutorial was rather fast. I didn't have time to think about the current question and we're moving on to the next problem already. :(
Saturday, January 23, 2010
Lesson on 22/1/2010
3. I learnt about Eudiometry. It's new to me. I find it useful that the general equation can be derived.
2. The lesson reinforced that actual yield < theoretical yield. I also learnt the term stoichiometric amount, which is the exact amount of a substance required/produced in a chemical reaction, as calculated by the mole ratio.
1. I understood that mole ratio=volume ratio. Hence, when the volumes of two required compounds are not available, we can use their amounts of substance.
2. I'm still unsure what are the chemicals that can be reacted by CO2 and excess O2 to remove CO2 in Eudiometry.
1. I still do not know what the two contractions represent. (example 24)
2. The lesson reinforced that actual yield < theoretical yield. I also learnt the term stoichiometric amount, which is the exact amount of a substance required/produced in a chemical reaction, as calculated by the mole ratio.
1. I understood that mole ratio=volume ratio. Hence, when the volumes of two required compounds are not available, we can use their amounts of substance.
2. I'm still unsure what are the chemicals that can be reacted by CO2 and excess O2 to remove CO2 in Eudiometry.
1. I still do not know what the two contractions represent. (example 24)
Tuesday, January 19, 2010
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