p toper location CALCULATIONS 1. Determine the molarity of your stock NaOH using
ID: 1029790 • Letter: P
Question
p toper location CALCULATIONS 1. Determine the molarity of your stock NaOH using the dilution formula: where M, and V, are the molarity and volume of the initial solution and M, and V, are the molarity and volume of the final (diluted) solution. Show all your calculations. 2. Determine the standardized molarity of your stock NaOH using your titration data. Average the results of the four trials. REVIEW QUESTIONS 1. Define the terms molarity, endpoint, and standardization. 2. What is the mole ratio between NaOH and KHP? A student performs a titration using a 25 ml. buret. If his initial buret reading is 0.10 mL NaOH and his final reading is 18.50 mL, what is the volume used? The same student used a KHP sample mass of 0.402 g. The molar mass of KHP is 204.2 g/mol. Calculate the following: a. moles KHP used b. moles NaOH used c. Molarity of NaOH 5. How will you know when the reaction is complete? 6. Burets and volumetric flasks are accurate to how many decimal places? Chemistry 131 EXPERIMENT8Explanation / Answer
1.Molarity: it is to define concentration of a solution. Its defined as no. Of moles of solute dissolved in 1L of a solution or
Molarity = no.of moles of solute dissolved / volume of solution in L
End point: its the practical last point of a reaction which tells that the reaction is over.
It may be defined as its the point of a reaction where in the indicator used shows that the amount of titrant added to the titrand is enough for the completion of the reaction.
Standardization: its the process of determining the concentration ( molarity usually) of a solution by reacting with another solution whose concentration is known. Titration is one of its method used for standardization.
3. Final burette reading: 18.50 ml
Initial burette reading: 0.10ml
Volume consumed:( final burette reading - initial burette reading) = 18.50ml - 0.10ml = 18.40ml
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