# 27. The titration of 80.0 mL of an unknown concentration H_3PO_4 solution requires 126 mL of...

## Question:

27. The titration of 80.0 mL of an unknown concentration H_3PO_4 solution requires 126 mL of 0.218 M KOH solution. What is the concentration of the H_3PO_4 solution?

a. 1.03 M

b. 0.343 M

c. 0.114 M

d. 0.138 M

28. Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water. Determine the molality of the HCl, if the solution has a density of 1.20 g/mL.

a. 39.0 m

b. 17.5 m

c. 6.39 m

d. 10.7 m

e. 9.44 m

29. The element that corresponds to the electron configuration 1s^22s^22p^63s^23p^64s^2de^5 _.

a. titanium

c. chromium

## Acid Base Titration:

Acid base titration is an analytical technique where a solution of known concentration is used to determine the concentration of the unknown solution. The volumes of both solutions are also known because they can be easily measured during the experiment.

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#### Question 27

c. 0.114 M

The reaction between {eq}H_3PO_4 {/eq} and KOH is

$$H_3PO_4 + 3KOH \rightarrow 2H_2O + K_3PO_4$$

Now we will use the...