Question

15) A sulphuric acid (H2SO4(aq)) solution has a molarity of 4.50 M, and a density of 1.26 g/mL. a) Convert this concentration to % by mass. b) If 15.00 mL of this acid solution is diluted with water to a total volume of 500.0 mL what is the concentration of the diluted solution? 16) A 10.00 mL sample of phosphoric acid was titrated with 17.94 mL of 0.520 M NaOH. The balanced chemical equation for the reaction of phosphoric acid with sodium hydroxide is: H3PO4(aq) + 3NaOH(aq) ? Na3PO4(aq) + 3H2O(l) a) Determine the concentration of the phosphoric acid sample in moles/L. b) If the density of the acid solution is the same as that of water (1.00 g/mL), what is the percent by mass of H3PO4 in the acid?

          15) A sulphuric acid (H2SO4(aq)) solution has a molarity of 4.50
M, and a density of 1.26 g/mL.
a) Convert this concentration to % by mass.
b)  If 15.00 mL of this acid solution is diluted with water
to a total volume of 500.0 mL what is the concentration of the
diluted solution?
16) A 10.00 mL sample of phosphoric acid was titrated with 17.94
mL of 0.520 M NaOH. The balanced chemical equation for the reaction
of phosphoric acid with sodium hydroxide is:
H3PO4(aq) + 3NaOH(aq) ? Na3PO4(aq) + 3H2O(l)
a) Determine the concentration of the phosphoric acid sample in
moles/L.
b) If the density of the acid solution is the same as that
of water (1.00 g/mL), what is the percent by mass of H3PO4 in the
acid?

Added by Sydney R.

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