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• Sodium Sulphate LR Grade is a battery life saver which prevents battery by early premature failure It is used in electrolyte of free flooded conventional lead acid & VRLA batteries 
• By adding common ions (Sulphate Ions) to the acid electrolyte reaction, it will increase the sulfuric acid concentration and hard ions of lead Sulphate will soluble so fast, so that the specific gravity increases up to a level in all cells of lead acid batteries
• Sodium Sulphate Tablets Work In Lead Acid Batteries
• Sodium Sulphate are highly water soluble salts and they dissociate in water, producing Sulphate ions
• Concentration of these salts have been kept at such level that conductivity is high and this helps electrical current to pass through it
• The addition of sodium Sulphate provides an inventory (excess) of Sulphate ion that are available for more conductance
• The growth of larger crystals, called hard Sulphate occurs by a dissolution precipitation process when the battery is in a discharged condition
• Lead Acid Battery Reactions:
• The reaction in lead acid battery is reversible as shown below :
• Sulphate ions are common in both charge and discharge reactions
• The reaction is also known as double Sulphate theory
• During discharge lead Sulphate builds up and becomes insulating material, thereby increasing internal resistance of the cell / battery
• Whenever a solution of an ionic substance comes into contact with another ionic compound with a common ion, the solubility of the ionic substance decreases significantly
• On the other hand in case of discharging : When Na2 SO4 is added as additive to in an electrolyte medium Diluted Sulphuric acid then the concentration of Sulphate ion increases, so that the solubility of Pb SO4 increase
• According to famous scientist, Lechatelier & his hypothesis that, when a chemical reactants are at equilibrium, the addition of more of one of the ions from another compound will shift the composition to the left, reducing the concentration of other ion and effectively reducing the solubility of the solid to maintain the equilibrium
• By Adding Sodium Sulphate Sulphate into lead Sulphate, it will increases the concentration of Sulphate ions in Lead Sulphate, So that Formation of Sulfuric acid will be more faster to attend the equilibrium also the cell reaction becomes faster for the production of Lead Sulphate in case of discharging and sulfuric acid in case of charging