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MrMuchimi
3 years ago
10

What is the little “bump” of energy that is shown at the beginning of the reaction...the energy required to start the reaction

Chemistry
1 answer:
Darya [45]3 years ago
8 0
Activation energy?? The energy needed to start a chemical reaction is called activation energy
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• We obtained the above 10.00-mL solution by diluting a stock solution using a 1.00-mL aliquot and placing it into a 25.00-mL vo
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a) The relationship at equivalence is that 1 mole of phosphoric acid will need three moles of sodium hydroxide.

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H_3PO_4 \ + \ 3NaOH -----> Na_3 PO_4 \ + \ 3H_2O

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The relationship at equivalence is that 1 mole of phosphoric acid will need three moles of sodium hydroxide.

b)  if 10.00 mL of a phosphoric acid solution required the addition of 17.50 mL of a 0.200 M NaOH(aq) to reach the endpoint; Then the molarity of the solution is calculated as follows

H_3PO_4 \ + \ 3NaOH -----> Na_3 PO_4 \ + \ 3H_2O

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c) What was the molar concentration of phosphoric acid in the original stock solution?

By stoichiometry, converting moles of NaOH to H₃PO₄; we have

= 0.0035 \ mole \ of NaOH* \frac{1 mole of H_3PO_4}{3 \ mole \ of \ NaOH}

= 0.00166 mole of H₃PO₄

Using the molarity equation to determine the molar concentration of phosphoric acid in the original stock solution; we have:

Molar Concentration =  \frac{mole \ \ of \ soulte }{ Volume \ of \ solution }

Molar Concentration = \frac{0.00166 \ mole \ of \  H_3PO_4 }{10}*1000

Molar Concentration = 0.166 M

∴  the molar concentration of phosphoric acid in the original stock solution = 0.166 M

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1. Write the equilibrium constant expression for the following:
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