Please help especially with 1 and 2 If you dissolve K_2CO_3, in water, the potas

Question

Please help especially with 1 and 2 If you dissolve K_2CO_3, in water, the potassium will act as a Lewis acid toward water with a pKa of approximately 14, while the carbonate anion will act as a -Lowry base. Write equilibrium reactions as net ionic equations representing these two equilibria. Based on the pKa of the hydrated potassium and the pKb of carbonate, would the pH of a K_2CO_3 solution be acidic, basic, or neutral? A buffer is prepared with 10.0 mL of 0.150 M formic acid (Ka=1.80 times 10^-4) and 10.0 mL of 0.125 M sodium solution. What the is pH of this buffer? Please provide the keyword(s) for the following three GHS safety symbols and briefly describe the precautions associated with each one.

Explanation / Answer

(1)

K+ + H2O <-----> KOH + H+

CO32- + H2O <----> HCO3- + OH-

The reaction 1 above will produce KOH, which will not remain in this aggregated form, but would rather dissoicate back into K+ and OH-. Thus an aqueous solution of K2CO3 is strongly alkaline.

(2)

pH = pKa + log(moles of conjugate base/moles of acid)

pH = 3.74 + log( (10*0.125) / (10*0.150) ) = 3.66

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