If I were to use dichromate and add HCL and Ba(NO3)2 and NaOH , what should form?
Im thinking the Ba(NO3)2 would still form a precipitate but im not too sure about everything else
sorry about the re-post
it was an accident
Here is a very very good web site that talks about the CrO4^-2/Cr2O7^-2 equilibrium with H^+ and what happens with added H^+, then OH^-. In essence, BaCrO4 is insoluble so that yellow ppt is what you get when Ba(NO3)2 is added to CrO4^-2. BaCr2O7 is relatively soluble; therefore, it will not ppt unless there in huge amounts. After reading the material that talks about the equilibrium in broad terms, go back to the top and click on the highlighed area that is underlined. That takes you to another page that explains in detail how the equilibrium works.
http://www.digipac.ca/chemical/equilibrium/dichromate/dichromate3.htm
Thank You :D
To determine the products that will form when dichromate (Cr2O7^2-) is reacted with HCl, Ba(NO3)2, and NaOH, we need to consider the chemical reactions that could occur. Let's break it down step by step:
1. Dichromate (Cr2O7^2-) and HCl (hydrochloric acid):
- Dichromate is a strong oxidizing agent.
- In an acidic environment (like when we add HCl), dichromate can be reduced to chromate (CrO4^2-) ions:
Cr2O7^2-(aq) + 14H^+(aq) + 6Cl^-(aq) → 2CrO4^2-(aq) + 7H2O(l) + 3Cl2(g)
- Chlorine gas (Cl2) is also produced as a byproduct.
2. Dichromate and Ba(NO3)2 (barium nitrate):
- Barium is a heavy metal, and dichromate is a strong oxidizing agent.
- When mixed, a reaction called a double displacement or metathesis reaction can occur:
Cr2O7^2-(aq) + Ba^2+(aq) → BaCr2O7(s)
- A yellowish-orange precipitate of barium chromate (BaCr2O7) is formed.
3. Dichromate and NaOH (sodium hydroxide):
- Sodium hydroxide is a strong base.
- In an alkaline environment, dichromate can be reduced to chromate ions:
Cr2O7^2-(aq) + 2OH^-(aq) → 2CrO4^2-(aq) + H2O(l)
- This reaction forms chromate ions (CrO4^2-) and water.
So, when dichromate is reacted with HCl, Ba(NO3)2, and NaOH:
- Chromate ions (CrO4^2-) are formed in both the acidic and alkaline reactions.
- Barium chromate (BaCr2O7) precipitate forms in the reaction with Ba(NO3)2.
Remember to always exercise caution and perform experiments in a controlled environment with proper safety measures in place.