Sample of KHP contaminated with NaCl change molarity
Homework Answers
this will cause the molarity of NaOH is higher than its real value.
MNaOH = MKHP* VKHP/ VNaOH
when you use the contaminated KHP to make a solution of KHP, its real concentration will be low than what you calculated. it means you need use moreimpure KHP (though you didn't realize it, you think it is pure) to titrate NaOH sample. The VKHPvalue will be bigger,while MKHPand VNaOHhave not been affected by this contamination. As a result, MNaOHbecome biggerthan its real value.
i need help with these three questions Incorrect Question 2 0/1.25 pts 0.678 g of KHP...
i need help with these three questions
Incorrect Question 2 0/1.25 pts 0.678 g of KHP is used to standardize a NaOH solution. If it took 31.55 mL of NaOH to neutralize the KHP, what is the concentration of the NaOH solution? The molar mass of KHP is 204.22 g/mol. KHP + NaOH --> NaKP + H2O Give the answer to 3 sig figs and use units of M 0.0214 Unanswered Question 3 0/1.25 pts A 25.00 mL HCl sample...
A student gets a 3 mL sample of saturated KHP at 28.0°C. It takes 27.6 mL...
A student gets a 3 mL sample of saturated KHP at 28.0°C. It takes 27.6 mL of 0.107 M NaOH to titrate to the endpoint. How many moles of NaOH is this? How many moles of KHP were present in the sample? what is the molarity of the saturated KHP solution? What is the value of Ksp for this solution? (Assume syringe volume is good to 2 dp. Assume buret volume is good to 2 dp. Assume molarity of NaOH...
not sure if molarity of NaOH was calculated correctly and also unsure of how to find...
not
sure if molarity of NaOH was calculated correctly and also unsure
of how to find deviation
Molarity of KHP: _0.500 Volume of KHP: 25mL How many moles of KHP are in the flask? 1L 0.500 moles - 0.0125 moles KHP 25mL KHP- How many grams of KHP is in the flask? (MW - 204.22g/mol) 0.0125 moles XHP.med = 2.55g KHP Desired NaOH Concentration: Trial #1 2.75 0 Trial #2 2.75 0 Trial #3 2.75 0 33.05 33.01 32.97 Initial...
A 25.00 mL sample of nitric acid requires 19.63 mL of 0.1103 M NaOH to reach...
A 25.00 mL sample of nitric acid requires 19.63 mL of 0.1103 M NaOH to reach the end point of the titration. What is the molarity of the nitric acid solution? 0.536 grams of KHP were added to 100.0mL of water. What is the molarity of the KHP solution? (Do not type units with your answer.) Following the procedure for today's lab, a 0.0206 M KHP solution requires 24.59 mL of NaOH solution to titrate it. What is the molarity...
Standardization of NaOH solution experiment: A 0.75 g sample of pure acid KHP was titrated to...
Standardization of NaOH solution experiment: A 0.75 g sample of pure acid KHP was titrated to phenolphthalein endpoint using 45.34 ml NaOH of unknown concentration. The formula weight of pure KHP is 204.22g/mol. Write the chemical equation for the neutralization reaction, indicate the color change of the indicator at the endpoint, and calculate molarity of the NaOH solution. Show your work. 1. Chemical equation ------------- 2. Endpoint color change ---- 3. NaOH molarity --------- Determine percent purity of impure KHP...
A student weighs a sample of potassium hydrogen phthalate (KHP) to prepare a primary standard for...
A student weighs a sample of potassium hydrogen phthalate (KHP) to prepare a primary standard for a titration. She later discovers that the KHP was contaminated with sugar. To determine the amount of KHP in the mixture, she takes 5.942 g of the mixture and make a 100.0 mL solution. The student then titrates 10.00 mL of this solution with a 0.1491 M sodium hydroxide solution. She finds that 13.12 mL of the NaOH solution is needed to reach the...
LABORATORY EXPERIMENTS IN GENERAL CHEMISTRY 154 If 0,1000 M is used as the molarity of the NaOH solution in questio...
LABORATORY EXPERIMENTS IN GENERAL CHEMISTRY 154 If 0,1000 M is used as the molarity of the NaOH solution in question 6, would 7 the final %Na2CO3 in the soda ash sample be greater than, less than, or equal tothetrue % Ña,соз in the soda ash sample? Failing to dry the potassium acid phthalate prior to its use would 8. a) cause the molarity of the NaOH you obtain to be greater than, less than, or equal to the true molarity...
Questions: 1. 495 mg of dried KHP is dissolved in 35 mL of distilled water and...
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Suppose that the lab prep staff incorrectly recorded the masses of KHP. You are told they...
Suppose that the lab prep staff incorrectly recorded the masses of KHP. You are told they used 0.50 g of KHP to standardize the NaOH solution; however, they actually used 0.10 g KHP in the standardization. What will this do to your calculated concentration of the unknown HCI solution? Explain your answer.
1. How many grams of pure, solid NaOH are required to make 400 mL of 0.1M NaOH solution? 2. How many grams of a sol...
1. How many grams of pure, solid NaOH are required to make 400 mL of 0.1M NaOH solution? 2. How many grams of a solution that is 50% by weight NaOH is required to make 400 mL of 0.1M NaOH solution? 3. The density of a 50% solution of NaOH is 1.525 g/mL. What volume of a solution that is 50% by weight NaOH is required to make 300 mL of 0.1M NaOH solution? 4. Why does weighing by difference...
i need help with these three questions
Incorrect Question 2 0/1.25 pts 0.678 g of KHP is used to standardize a NaOH solution. If it took 31.55 mL of NaOH to neutralize the KHP, what is the concentration of the NaOH solution? The molar mass of KHP is 204.22 g/mol. KHP + NaOH --> NaKP + H2O Give the answer to 3 sig figs and use units of M 0.0214 Unanswered Question 3 0/1.25 pts A 25.00 mL HCl sample...
A student gets a 3 mL sample of saturated KHP at 28.0°C. It takes 27.6 mL of 0.107 M NaOH to titrate to the endpoint. How many moles of NaOH is this? How many moles of KHP were present in the sample? what is the molarity of the saturated KHP solution? What is the value of Ksp for this solution? (Assume syringe volume is good to 2 dp. Assume buret volume is good to 2 dp. Assume molarity of NaOH...
not
sure if molarity of NaOH was calculated correctly and also unsure
of how to find deviation
Molarity of KHP: _0.500 Volume of KHP: 25mL How many moles of KHP are in the flask? 1L 0.500 moles - 0.0125 moles KHP 25mL KHP- How many grams of KHP is in the flask? (MW - 204.22g/mol) 0.0125 moles XHP.med = 2.55g KHP Desired NaOH Concentration: Trial #1 2.75 0 Trial #2 2.75 0 Trial #3 2.75 0 33.05 33.01 32.97 Initial...
Standardization of NaOH solution experiment: A 0.75 g sample of pure acid KHP was titrated to phenolphthalein endpoint using 45.34 ml NaOH of unknown concentration. The formula weight of pure KHP is 204.22g/mol. Write the chemical equation for the neutralization reaction, indicate the color change of the indicator at the endpoint, and calculate molarity of the NaOH solution. Show your work. 1. Chemical equation ------------- 2. Endpoint color change ---- 3. NaOH molarity --------- Determine percent purity of impure KHP...
A student weighs a sample of potassium hydrogen phthalate (KHP) to prepare a primary standard for a titration. She later discovers that the KHP was contaminated with sugar. To determine the amount of KHP in the mixture, she takes 5.942 g of the mixture and make a 100.0 mL solution. The student then titrates 10.00 mL of this solution with a 0.1491 M sodium hydroxide solution. She finds that 13.12 mL of the NaOH solution is needed to reach the...
LABORATORY EXPERIMENTS IN GENERAL CHEMISTRY 154 If 0,1000 M is used as the molarity of the NaOH solution in question 6, would 7 the final %Na2CO3 in the soda ash sample be greater than, less than, or equal tothetrue % Ña,соз in the soda ash sample? Failing to dry the potassium acid phthalate prior to its use would 8. a) cause the molarity of the NaOH you obtain to be greater than, less than, or equal to the true molarity...
Questions: 1. 495 mg of dried KHP is dissolved in 35 mL of distilled water and titrated with potassium hydroxide (KOH). If it took 22.02 mL of KOH to reach the endpoint, determine the concentration of KOH. Show calculations. If you forgot to dry the above KHP sample and it was later determined to contain 5.00 % water by weight, what would be the actual concentration of the KOH, taking into account the water content? Show calculations. 2. If you...
1. How many grams of pure, solid NaOH are required to make 400 mL of 0.1M NaOH solution? 2. How many grams of a solution that is 50% by weight NaOH is required to make 400 mL of 0.1M NaOH solution? 3. The density of a 50% solution of NaOH is 1.525 g/mL. What volume of a solution that is 50% by weight NaOH is required to make 300 mL of 0.1M NaOH solution? 4. Why does weighing by difference...
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