Calculate the mass of KHP which will result in an endpoint of 20.00mL when titrated against 0.097M NaOH
Another acid/base titration problem. The only difference is that KHP is a solid and not a liquid. (The liquids are mlols = grams/molar mass.). Solids are
mols = g/molar mass.
To calculate the mass of KHP (potassium hydrogen phthalate) needed for a titration with NaOH, you'll need to use the equation:
Moles of KHP = Moles of NaOH
First, let's calculate the moles of NaOH:
Molarity of NaOH (M1) = 0.097 M
Volume of NaOH used (V1) = 20.00 mL = 0.02000 L (converted to liters)
Moles of NaOH = M1 × V1
= 0.097 M × 0.02000 L
= 0.00194 moles
Since the ratio between KHP and NaOH is 1:1, the moles of KHP will be the same as the moles of NaOH.
Now, let's calculate the mass of KHP using its molar mass:
Molar mass of KHP = 204.23 g/mol
Mass of KHP = Moles of KHP × Molar mass of KHP
= 0.00194 moles × 204.23 g/mol
= 0.396 g (rounded to three decimal places)
Therefore, the mass of KHP required for the titration in order to achieve an endpoint of 20.00 mL is approximately 0.396 grams.
To calculate the mass of KHP (potassium hydrogen phthalate) required for a titration, you need to know the volume and concentration of the NaOH (sodium hydroxide) solution used, as well as the stoichiometry of the reaction.
Here's how you can calculate it step by step:
Step 1: Write the balanced chemical equation for the reaction between KHP and NaOH.
KHP + NaOH → KNaP + H2O
Step 2: Determine the stoichiometry of the reaction.
From the balanced equation, we see that 1 mole of KHP reacts with 1 mole of NaOH.
Step 3: Calculate the number of moles of NaOH used in the titration.
Moles of NaOH = volume of NaOH (in liters) × concentration of NaOH
Given:
Volume of NaOH = 20.00 mL = 0.02000 L
Concentration of NaOH = 0.097 M
Moles of NaOH = 0.02000 L × 0.097 M = 0.00194 moles
Step 4: Since the stoichiometry of the reaction is 1:1, the number of moles of KHP needed will be equal to the number of moles of NaOH used.
Moles of KHP = 0.00194 moles
Step 5: Determine the molar mass of KHP (potassium hydrogen phthalate).
The molar mass of KHP can be found by adding up the atomic masses of its constituent elements:
K: 39.10 g/mol
H: 1.01 g/mol
C: 12.01 g/mol
8 × O: 8 × 16.00 g/mol
Molar mass of KHP = 39.10 g/mol + 1.01 g/mol + 12.01 g/mol + (8 × 16.00 g/mol) = 204.22 g/mol
Step 6: Calculate the mass of KHP using the moles of KHP obtained in Step 4 and the molar mass of KHP obtained in Step 5.
Mass of KHP = Moles of KHP × Molar mass of KHP
Mass of KHP = 0.00194 moles × 204.22 g/mol = 0.3962 grams
Therefore, the mass of KHP needed to reach an endpoint of 20.00 mL when titrated against 0.097M NaOH is 0.3962 grams.