4 zn 0 + n +5 o-2 3-+ 10h + → 4 zn +2 2+ + n-3 h +1 4 + + 3h 2 o Finally , always check to see that the equation is balanced. First, verify that the equation contains the same type and number of atoms on both sides of the equation.
concentrated aqueous NH3. 2) While stirring, pour this solution into a solution containing 15g (0.052 mole) of [Co(OH2)6](NO3)2 in 30 mL of water. 3) Slowly add 8 mL of a 30 percent H2O2 solution. 4) Pour the solution into an evaporating dish and concentrate over a gas burner in a fume hood to 100 mL. Do not allow the solution to boil.
At low Ni(NO 3) 2 concentrations, the Faradaic efficiency of the deposition is nearly 100%, e.g. [Ni(NO 3) 2]<0.2 M at 0.5 mA cm −2 . That is, approximately 1 mol of Ni(OH) 2 is produced for every 2 mol of hydroxide produced at the electrode surface.
BaSO4 Ni(NO3)2·6H2O. c. When AgNO3(aq) is added to an aqueous solution of the unknown compound, a white precipitate forms. In the table below, cross out each compound that can be eliminated using this test. Be sure to cross out the same compound(s) in the table in part d. Al(NO3)3·9H2O BaCl2·2H2O CaCO3 CuSO4·5H2O NaCl. BaSO4 Ni(NO3)2·6H2O. d.
Therefore, if you mix the two solutions, everything will stay aqueous except for combinations that are insoluble. Thus in this case, Ba 2+ will combine with SO4 2- to form the solid BaSO4. Also, H+ and OH- will form the liquid H20. Just have to remember H+ and OH- do that. Thus the net equation is Ba(OH)2(aq) + H2SO4(aq) -> 2H20(l) + BaSO4(s)
Both calcium nitrate and sodium hydroxide are soluble salts, so they will dissociate completely in aqueous solution to form. Ca(NO3)2 (aq] → Ca2+ (aq] + 2NO− 3 (aq] NaOH(aq] → Na+ (aq] + OH− (aq] This means that the concentrations of the calcium cations and hydroxide anions will be.
BaCl 2 + K 2 SO 4 BaSO 4 + 2 KCl By examining the solubility rules we see that, while most sulfates are soluble, barium sulfate is not. Because it is insoluble in water we know that it is the precipitate. As all of the other substances are soluble in water we can rewrite the equation. BaCl 2 (aq) + K 2 SO 4 (aq) BaSO 4 (s) + 2 KCl(aq)