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Use Le' Chatelier's Principle. this is a solution at equilibrium: 2CrO4^2-(aq)+ 2H^+(aq)< >Cr2O7^2-(aq) +H20 2CrO4^2- yellow Cr2O7^2- orange I just have to make predictions of the colour changes when: a)Add 0.3 M NaOH drop to 5 drops of 0.3 M K2CrO4 b)Add...

so lets say for c. HCl adds H+ ions to the product side which makes it more acidic and therefore yellow?

so i am a bit confused it mainly depends on whether you add H+ (from HCl) or OH- (from NaOH)? it does not matter whether u add it to CrO4^-2 or Cr2O7^-2? Because when you add HCl it reacts with H+ which is on the left so the equilibrium moves towards the...