7. 0.0048967 moles of potassium hydrogen phthalate (KHP)
8. molar concentration of NaOH solution is 1 M
Explanation:
7. If 1 gram of potassium hydrogen phthalate (KHP) reacted in the titration reaction, how many moles reacted? The molar mass of KHP is 204.22 g/mole.
To solve this we use the following formula:
number of moles = mass / molar weight
number of moles of KHP = 1 g / 204.22 g/mole
number of moles of KHP = 0.0048967 moles
8. What is the molarity of a solution of sodium hydroxide (NaOH) if 4.0 grams of NaOH is dissolved in 100 mL of water. The molar mass of NaOH is 40.0 g/mole.
First we calculate the number of moles of NaOH:
number of moles = mass / molar weight
number of moles of NaOH = 4 g / 40 g/mole = 0.1 moles
Now to determine the molarity of the solution we use the following formula:
molar concentration = number of moles / volume (L)
molar concentration of NaOH solution = 0.1 moles / 0.1 L = 1 M
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