Home Chemistry 12
I have made a video where I give a basic introduction to using the Molecular solutions calculator from Physiology Web.
I am just using Citric Acid as an example of how the calculator works.
This is a good tool to double check your calculations.
I have uploaded what I hope is an improved version of this.
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#Chemistry,#HomeChemistry,#HomeChemistry12,#MolarSolutions, #Calculator
STEM Group 11/3/2023
At the stem group today we are going to be looking at Red Cabbage indicator.
I have prepared some solutions we can test, Jess, one of the librarians had prepared some red cabbage indicator for us.
This uses a different preparation method, but the result is the same, a universal indicator.
So we will be undertaking this at Paignton Library, in room 12, as this is more suitable, has sinks, running water etc.
Some of the items we can test include:-
Discussions
I am happy to discuss or try and answer questions on
I am also hoping to make some videos on Saturday, these will be shared on my Peertube account.
Home Chemistry – 13 Sodium Carbonate Solution
While I wait for my Better Equipped order, I decided to make a Solution of Calclum Carbonate $\ce{CaCO3}$, upon calculating the amount needed. I found that I didn't have enough Calcium Carbonate available.
So on to plan b. Looking through the chemicals I do have, found some Sodium Carbonate, $\ce{Na2CO3}$
Mass of $\ce{Na2CO3}$ = 105.988 g/mol Solution = 100ml Concentration = 0.5 Mass of $\ce{Na2CO3}$ needed = 5.29g
So I made this up after carefully measuring the ingredients.
This is now stored in a 100ml conical flask until the bottles arrive from better equipped.
I tested the final solution in a test tube by mixing a very small amount with white Vinegar to produce a reaction.
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#Chemistry,#HomeChemistry,##HomeChemistry13,Sodium,#Carbonate
Home Chemistry – 12 update
I have some equipment on order from Better Equipped for myself to help support the STEM group, this is mostly some 100ml glass regent bottles to properly store various solutions.
Also sent off for another test tube brush and a flask brush for use at the library.
I am also putting together some kit to create a very simple distillation rig, which is mostly a 2L plastic bottle, a measuring cylinder, and a bag of ice, so that this helps to condense water in to the cylinder. This is very basic but should do the trick. At least according to the manual I got with a chemistry set bought for £2.50 from a charity shop.
If this works, then I can replicate the same set up, perhaps in schools to help children understand this process and discuss why it is important.
Home Chemistry 11 – Making a Citric Acid solution
Further to the previous post on making molar solutions I am going to make up a 250ml solution of Citric acid.
So based on my previous calculations
1 Molar solution is formula weight in 1 litre of Water
Molar Weight of Citric acid 192.19 Amount of Water = 250ml (0.250 l)
Therefore
192.19 / 4 = 48.03g
I can weigh this out easy enough now that I have got some small scales (which are actually used for weighing jewellery) but are really good as they measure to 2 decimal places. Granted max is about 200g, but for what I am doing in chemistry this doesn't matter too much.
The first task is to weigh out the required amount of Powder.
Given I wanted 48.03g, I think for the purpose of home chemistry this is fine.
For the next step I mixed the powder with about 200ml water, stirred well then poured (via funnel) in to a conical flask and topped up to about 250ml (note the flask is approximate.) I may be just over. in a proper laboratory, I would have access to a volumetric flask, which is more accurate. I am making do with what I have.
I would probably have access to some help with this too.
Finally, the solution is poured (via funnel) in to a suitable bottle, that I have already put a label etc on.
This is now stored safely before being taken down to the Library.
We can then use this for various experiments such as adding to alkalis, using indicator (paper or liquid) or whatever else we decide to do).
There is a really nice calculation tool which you can use to help or at least double check calculations.
#HomeChemistry11,#Chemistry,#Science,#HomeChemistry,#CitricAcid,#Solution,#Molar,#Concentration
Home Chemistry 9
Testing out a syringe to measure reactant produced.
The British Science week primary pack has an experiment using
The idea is to determine which produces the best reaction
The experiment uses a balloon to collect the $CO_2$ produced, and uses a tape measure to compare the results.
I am trying to modify this a little to avoid using a baloon, but use a syringe instead.
So the set up I am looking to use has
I have just tested this set up but used Bicarbonate of soda & Citric acid and then added water using a dropper to start the reaction. Putting the bung in quickly so the $CO_2$ doesn't have time to escape. Sure enough the syringe plunger moved as the gas was pushed in.
So the next step is to set this up at the library and use the ingredients above. I plan to set this up before the STEM group on Saturday and observe during the session, which should be over a good few hours. I can then tweak before the next session on March 11th.
Home Chemistry 8 – Reactions of metals with White Vinegar
So to continue this investigation further, I am adding Aluminium foil to White Vinegar and will also add Aluminium foil to Citric Acid and compare what happens.
Initial thoughts are that the reaction with White Vinegar is much slower, which is expected when you compare where the two metals being tested are on the Electrochemical series.
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Home Chemistry 7 – Reactions of metals with White Vinegar
Further to my previous experiment. Yesterday I added Magnesium Ribbon to some White Vinegar.
The video doesn't seem as good, part the issue is the light the other issue is the bubbles of Hydrogen produced do get in the way a little.
Video
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Home Chemistry 6 – Reactions of metals with Citric Acid
So while I wait for delivery of some more indicator paper. I am going to take a look at how Magnesium reacts with Citric Acid.
Firstly as indicated in a Previous post it is important to ensure the Magnesium metal is clean and free of tarnish. This will aid the reaction by exposing a greater surface area of the metal.
I will be using the same equipment as before,
As well as Citric Acid, which is shown here along side Bicarbonate of soda.
I decided to use a conical flash instead of a test tube and this makde it a little easier to observe the reaction.
I added some Citric Acid powder to the flask, added about 50ml water to dissolve the acid then added one piece of Magnesium ribbon, approx 1” long to the solution.
Took a few mins to get going, once the remaining tarnish had gone, the reaction speeded up.
Video
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Home Chemistry 5 – Electrochemical Series
As it was suggested revise the Electrochemical on Science Forums. I am including a video from youtube on this topic.
This is presented by Fuzeschool Global Education
Happy to discuss on the Fediverse, but it would be better to ask on Science Forums.
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#Chemistry,#Reactivity,#ElectroChemicalSeries,#HomeChemistry