Please help answer the questions Exp. 4 1. Write out the balanced chemical equat

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Please help answer the questions

Exp. 4 1. Write out the balanced chemical equation for the reaction of 1 mole of NaoH with 1 mole of H3PO4 2. Write out the balanced chemical equation for the reaction of 2 moles of NaoH with 1 mole of H3PO4 3. In this experiment, we didn't need an indicator because the pH electrode was attached to an interface, which allowed the computer to plot pH versus volume of NaoH delivered This plot gave you the first two equivalence points. If you were trying to find the two equivalence points, what indicator solution(s) would you use? Do some research and suggest one indicator solution for each equivalence point, and if you find one indicator that will reveal both equivalence points you can list it twice. First equivalence point Second equivalence point:

Explanation / Answer

1)

the balanced reaction:

H3PO4(aq) + 1NaOH(aq) = H2O(l) +Na3(PO4)2(aq) + H2PO4-

H3PO4 + NaOH NaH2PO4 + H2O

2)

H2PO4-(aq) + 2NaOH(aq) = H2O(l) + NHPO4-2(aq)

H3PO4 + 2NaOH Na2HPO4 + 2H2O

3)

the most suitable indicator for a H3PO4 is

since it will turn in different colors

use mthyl orange (1st) and thymolphthalein(2nd) for H3PO4 titrations (especially fothe first 2 H+ ions, before it turns into basic solution)

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