Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
**RoRo**:
Heey,
I have a question:
How do you know that a base is soluble or not?
And to make a soluble salt, when do you use titration and when do you use the method where you add excess of the base to the acid?
Thanks a lot in advance :)
Vin:
--- Quote from: Raywin on June 05, 2010, 05:46:09 am ---Hey guys, :) umm a doubt. In electrolysis, is the products formed at the cathode and anode influenced by whether its a concentrated or dilute solution? Like if it is a dilute solution, will the H+ ions will have more chance of going to the cathode rather than a less reactive metal say copper and likewise the other way round, a concentrated solution will have the metal going to the cathode rather than Hydrogen? Does this happen? Thanks ;D
--- End quote ---
yes, you are right...
have a look at this presentation
Vin:
--- Quote from: **RoRo** on June 05, 2010, 06:58:05 am ---Heey,
I have a question:
How do you know that a base is soluble or not?
And to make a soluble salt, when do you use titration and when do you use the method where you add excess of the base to the acid?
Thanks a lot in advance :)
--- End quote ---
All Chlorides, bromides and iodides are soluble except the chloride/bromide/iodide of lead, silver and mercury.
All carbonates are insoluble except Sodium, potassium and all group 1 metals and ammonium carbonates
All hydroxides are insoluble except Sodium, potassium(All group 1 metals in general), ammonium, calcium, strontium and barium hydroxides, aq.ammonium, which are soluble.
All sulfates are soluble except the sulfates lead , barium and calcium
If you want to make a soluble salt, you must use the bases in bold^^ and ofc. an acid
If you want the acid to be reacted fully then you may use excess of a base
Raywin:
--- Quote from: ~VIN1094~ on June 05, 2010, 07:59:50 am ---yes, you are right...
have a look at this presentation
--- End quote ---
Thanks a lott.. :)
stuntjoe:
guys i have a question....... the question says that the atomic structure of substance X is shown it has 2 electrons in the first and outer shell n in the nucleus 5 proton n 6 nucleons what's the relative charge n mass of each ???
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