October 29, 2020, 09:46:39 AM
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91
Inorganic Chemistry Forum / Re: (Cu(NH3)4)SO4 + KI = ?
« Last post by AWK on October 26, 2020, 02:42:20 PM »
Try to write a balanced reaction equation and think about what side reactions can occur - one I have already mentioned - the formation of basic copper sulfate.
92
Inorganic Chemistry Forum / Re: (Cu(NH3)4)SO4 + KI = ?
« Last post by nino_ on October 26, 2020, 02:38:25 PM »
Do you know the exact proportions in which you mixed the reagents: CuSO4, NH3, and KI?
My guess is that the basic copper sulfate is responsible for the color, and also the product of CuI oxidation by oxygen from the air in the presence of water.

Well, the (Cu(NH3)4)SO4 was from a previous experiment, (CuSO4 + NH4OH, then precipitated with methanol), I then filtered it and dried it. I dont know how pure it is, but honestly it must be good enough since the powder was crystalline. I dont think there was much copper sulfate remaining, i washed it with lots of methanol/ammonia to make sure it's as pure as it can be (might need a recryst. though).

And for the KI... I didn't really write down how much I used, since it was just to see if there was a reaction. I think it was like 20g in 100ml of water ? Mixed with maybe 5g of the copper-ammonia complex in 100ml of water. I don't really remember and I don't have enough KI to redo the experiment, might have to order some.
93
High School Chemistry Forum / Re: balance this reaction
« Last post by AWK on October 26, 2020, 02:37:37 PM »
The way the reaction is written indicates that it must run in the molten state (otherwise Cr2O3 would not be formed). The oxygen can only be produced by the thermal decomposition of Na2Cr2O7 to NaCrO2. If you enter additionally NaCrO2 on the right side of the reaction equation, the reaction can be balanced. But at a temperature of 300°C, Na2CO3 and NaNO2 should form in the reaction - and this reaction can also be balanced.
94
Undergraduate General Chemistry Forum / Electroplating Nickel
« Last post by SamWebb1826 on October 26, 2020, 02:22:34 PM »
Is it possible to electroplate nickel onto a platinum cathode in a solution of nickel sulfate? And if not is there another inert metal that would work?
95
High School Chemistry Forum / Re: balance this reaction
« Last post by probe_22 on October 26, 2020, 02:15:04 PM »
i was arguing with my mates about the role of sodium ions: they says that sodium ions are spectator ones but i sustain that they aren't because there is a different quantity of them between products and reagents. so who is right?
96
High School Chemistry Forum / Re: balance this reaction
« Last post by AWK on October 26, 2020, 02:09:13 PM »
Hint - start from reading https://www.chemicalforums.com/index.php?topic=65859.0.
Moreover - this reaction cannot be balanced.
97
High School Chemistry Forum / balance this reaction
« Last post by probe_22 on October 26, 2020, 01:58:29 PM »
 NaSCN + Na2Cr2O7 → CO2 + NO2 + Cr2O3 + Na2SO4
any help?
the reaction medium isn't specified
98
Organic Chemistry Forum / Re: Gases dissolved in oil
« Last post by AWK on October 26, 2020, 01:49:07 PM »
Just search the literature for The Solubility of Gases in Fatty Oils.
99
Inorganic Chemistry Forum / Re: (Cu(NH3)4)SO4 + KI = ?
« Last post by AWK on October 26, 2020, 01:42:56 PM »
Do you know the exact proportions in which you mixed the reagents: CuSO4, NH3, and KI?
My guess is that the basic copper sulfate is responsible for the color, and also the product of CuI oxidation by oxygen from the air in the presence of water.
100
Organic Chemistry Forum / Re: Gases dissolved in oil
« Last post by ZHR on October 26, 2020, 01:35:51 PM »
Olive oil, canola oil etc.

I just want to figure out how different gas features effect gas soluablity in oil.
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