it equals:
8 hydrogen atoms
4 sulfur atoms
16 oxygen atoms
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The balanced equation for the reaction between borax (sodium borate) and sulfuric acid is: Na2B4O7·10H2O + 4H2SO4 → 4H3BO3 + 2Na2SO4 + 5H2O.
The balanced chemical equation is: Na2B4O7 + 4H2SO4 → 4H3BO3 + 2Na2SO4
K2Cr2O7 + 4H2SO4 + 6Cl-1----------> K2SO4 + Cr2(SO4)3 + 3Cl2 + 4H2O + 3O-2
To balance the chemical equation Pb + PbO2 + H2SO4 → H2O + PbSO4, start by balancing the Pb atoms on the left side by adding a coefficient of 2 in front of Pb on the left side. Then balance the SO4 atoms by adding a coefficient of 4 in front of H2SO4. The balanced equation is 2Pb + PbO2 + 4H2SO4 → 2H2O + 2PbSO4.
H2SO4 is added in the oxidation of alcohols with K2Cr2O7 as a catalyst to provide acidic conditions, which facilitate the oxidation reaction. The sulfuric acid protonates the alcohol to form an oxonium ion, which is more easily oxidized by the chromate ion in K2Cr2O7. This helps to increase the efficiency and speed of the oxidation process.