Which pair of compounds will form a buffer in aqueous solution? hcn and hcl nacn and naoh hcl and naoh nacn and kcn hcn and nacn hcl and nacl?

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

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Which of the following units is not an official si unit? mole liter kilogram ampere