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It's not that hard. You simply have to follow the given guidelines. Anyway, I will list down the major points.
In this experiment, we are to show how the solubility of K(NO3)2 varies with temperature. From the previous part of the question you must already know that the temperature is the independent variable (since it's in our control), and the solubility is the dependent variable.
Hope this helped!
- The first bullet point asks you that you should "ensure a wide range of results suitable for analysis by graph". They're basically asking what range are you going to provide for you independent variable. Basically when we conduct these experiments, we usually start from 0-100 degrees. The ms wants the candidates to give a range of at least 40 degrees.
- The second bullet point wants to know what mass of K(NO3)2 and volume of what you should use. Remember the independent variable in this experiment is the temperature. So temperature is only variable you're allowed to change. ALL the other variables are to be kept in control (needs to be constant). So you need a constant mass of K(NO3)2 (say 2 g) and a constant volume of water. (around 100 cm^3)
- The third one wants you to describe how you will "measure the amounts of the two reagents". This is an easy one. Measure the K(NO3)2 using a balance measuring up to 0.02g, and volume of water by a measruing cylinder measruing up to 1 cm^3
- The fourth point: "heat the apparatus". You could describe how you could use a thermostatically controlled water bath. You also have to mention that you have to stir the solution (they already gave you a wire stirrer- a BIG clue)
- In the fifth point, you need to describe what you would do. So say you heated the solution to 10 degrees- and after about 2-5 mins you took your boiling tube out, and filtered the solution and dried it (water and propanone), then you reweigh the remaining salt and subtract it from the initial mass. And you'll have your solubility of the solution for that particular temp. Do this for the rest of the values in your temp range.
yeah I saw dat..thnx a lott for ur help!
We can replace the test tube in which H2 is liberated with a conical flask right? because i realy don't like to draw apparatus in mid-airFor the diagram:
Replace the Copper with Lead though!
This is how you will heat the Lead oxides, with the excess hydrogen burning at the end of the tube. And instead of pipe to the gas tap, you should attach a syringe. And in another diagram on the same page, you should draw a a test tube, with a rubber bung, attached to the same syringe. In the contents of the tube, mention a gorup II metal (For eg: Mg) + a suitable acid, like HCl. This will liberate H2 gas into the syringe, which you will then attach to the apparatus shown above.
How do heat the solution to 10^C? can you please elaborate on that? Nice answers though
KnowITAll : you can use a stand to show dat d apparatus is not in mid air in stead its being held in air by the use of a stand...We can replace the test tube in which H2 is liberated with a conical flask right? because i realy don't like to draw apparatus in mid-air
Aah.. thanks sisterKnowITAll : you can use a stand to show dat d apparatus is not in mid air in stead its being held in air by the use of a stand...
ur most welcme!Aah.. thanks sister
So do think this diagram is right? u might wanna rotate itur most welcme!
Assalamu alaykum
here u goAssalamu alaykum
Don't you think it's a bit late now? Relax and pray, you'll be fine
I'll post the graph if i find it.
Yeah.. but look at what the mark scheme saysIsn't that wrong? The question asks you to draw a line of best fit. You drew a curve.
It's the curve of best fit.. a few brothers and sisters were discussing it a few pages back..Isn't that wrong? The question asks you to draw a line of best fit. You drew a curve.
solubility=( mass of solid/ mass of water ) x 100
dude can you please help me with q no 2 of May/June 2011 paper 52..
Alright, underline your kewords as you read the question.. tell me what you're gonna label your columns..i'll guide you inshAllah.
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