The reaction of Na2CrO4 (aq) and AgNO3 (aq) is as follows:
2AgNO3 (aq) +Na2CrO4 (aq) ⇒Ag2CrO4 (s) + 2NaNO3 (aq).
During this reaction, part of the CrO42- reacts with Ag+ and precipitates out of the solution, part of the CrO42- (excess amount) remains in the solution.
To find out how much CrO42- is reacted:
Moles of initial CrO42- = 0.075 L * 2.5 M = 0.1875 mole
Moles of initial Ag+ = 0.125 L * 1.79 M = 0.2238 mole
The reaction ratio between CrO42- and Ag+ is 1:2 according to the equation. So moles of CrO42- that is reacted is 0.2238 mole/2 = 0.1119 mole. Therefore, moles of CrO42- that remains in the solution is 0.1875mole-0.1119mole = 0.0756 mole
So the final concentration of CrO42- in the solution is 0.0756mole/(0.075L+0.125L)= 0.378 M.
Answer:
Calcium sulphate CaSO4 is a naturally occurring calcium salt . it is commonly known in it's dehydrated form , CaSO4 , 2H2O , a white or colourless powder called gypsum . Hydrated calcium sulphate {CaSO4 × H2O } countians 21% ( by mass) of water of crystalization i.e. it's hydrated form is CA= 40 S= 32 O= 16 H=1
Explanation:
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Answer:
Carbon has six electrons (2 core and 4 valence), and can form four bonds with neighboring atoms. Nitrogen has seven electrons (2 core and 5 valence)(1s2, 2s2, 2px1, 2py1, 2pz1). So if you are following the rules, you might well assume that nitrogen would be able to form five bonds (after all, it has five valence electrons.)