anthropos Posted May 31, 2007 Posted May 31, 2007 Yo, I am a 17 year old student and one day I saw this question in my textbook. "Acids are added to cola drinks to lower the pH to about 2.5 to impart tartness. Show that a cola that contains from 0.057 to 0.084% of 75% phosphoric acid (H3PO4), by mass, meets this pH requirement. " Can somebody explain the "0.057 to 0.084% of 75% phosphoric acid (H3PO4), by mass"? I don't quite get it.
insane_alien Posted May 31, 2007 Posted May 31, 2007 okay, say you have 1 gram of of 75% phosphoric acid by mass. that means that 0.75grams is pure H3PO4, the rest is water. the 0.057 to 0.084% refers to the amount of 75% phosphoric acid in the drink. compared to the mass of the drink as a whole. -1
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