A buffer system, used as an ingredient for a certain diet soft drink, is prepared by combining 2.00 L of a 0.250 M citric acid solution and 4.00 L of a 0.800 M sodium citrate salt solution.

Citric acid has a K_a value of 7.40 x 10^-4.

Calculate the number of moles of a Ba(OH)₂ solution that can be added to this buffer solution that will lead to depletion of the buffer.

Provide your answer with 3 significant figures.

ʼn Buffersisteem, wat as bestanddeel vir 'n sekere dieetkoeldrank gebruik word, word voorberei deur 2.00 L van 'n 0.250 M sitroensuuroplossing en 4.00 L van 'n 0.800 M natriumsitraat soutoplossing te kombineer.

Sitroensuur het ʼn K_a waarde van 7.40 x 10^-4. 

Bereken die aantal mol van 'n Ba(OH)₂ oplossing wat by hierdie bufferoplossing gevoeg kan word wat tot uitputting van die buffer sal lei.

Gee jou antwoord met 3 beduidende syfers.