Question

In: Chemistry

A student began his careful titration with an air bubble in the buret tip. The bubble...

A student began his careful titration with an air bubble in the buret tip. The bubble was released, unnoticed, before reaching the equivalence point on the titration curve.

a) Predict the effect on the measured volume of NaOH added to reach the equivalence point.

b) Predict the effect on the measured equivalence point pH value.

Solutions

Expert Solution

During the begining of a titration to standardize the NaOH solution,that student adjusted very carefully the initial burette volume to 0.00 ml,but he was not able to notice an air bubble in the tip of the burette.

At the end of the titration the bubble is gone,whihc means the volume measured is the volume of the titration + volume of bubble i.e its too large

Let us take an example of acid(standardised) vs base titration .The titrant (acid) is taken in a burette ,while base taken in a conical flask.Because of the presence of bubble at the tip ,extra amount of acid is entered in to the conical flask

According to the formulae

MA VA = MB VB ,Where MA molarity of acid, VA is( volume of acid required to complete the titration+acid containing bubble)

MB is molarity of base,   VB is the volume of base taken in conical flask

MB = MA VA,, where VA   is increases because of that bubble ,

VB

  1. Therefore equivalence point of the titration is high compared to the same titration perfomed when bubble is absent
  2. While the pH of the solution is low because of extra acidic component present in the solution(<7)

Related Solutions

Titration Lab Why are air bubbles in buret tip a possible source of error in a...
Titration Lab Why are air bubbles in buret tip a possible source of error in a titration experiment? When you reached the endpoint, the color of the solution went from colorless to a light pink. What does the endpoint tell you?
1) Assume an air bubble had been in the buret tip when you took your first...
1) Assume an air bubble had been in the buret tip when you took your first reading and it was replaced by NaOH during the course of the titration. Would your experimental value for the concentration of NaOH be too high, too low, or unchanged as compared to the true value? Explain 2) Assume the buret had been wet with water because it was not adequately rinsed with base. Would your experimental value for concentration of NaOH be too high,...
A soap bubble is floating in the air. The refractive index of the bubble is n...
A soap bubble is floating in the air. The refractive index of the bubble is n = 1.33. The width of the wall is 115 nm. The light that hits the bubble is reflected on the outer and inner surface and both interfere once they leave. The difference in phase for both for both lights will be wt, where t is the time it takes for the light to go and return through the soap layer (t = d /...
How should you prepare a buret for titration before loading it with titrant?
Question 2 How should you prepare a buret for titration before loading it with titrant? Select one: Remove air bubbles from the buret tip  Add some indicator to the buret Condition the buret with titrant solution Run some water through the buret.We were unable to transcribe this imageQuestion 3What appearance of an acidic analyte solution containing phenolphthalein indicates the endpoint of titration with a basic solution?Select one:A persistent pale pink color throughout the solution.A burst of pink color that disappears upon stirring.A persistent dark pink color...
"In the weak acid titration, if you had not prepared your buret properly and a considerable...
"In the weak acid titration, if you had not prepared your buret properly and a considerable amount of water was left in it, what would have been the effect on the calculated value of Ka?" I generally know that the Ka of an acid remains constant no matter what, but in this case, the Ka of the weak acid being titrated can be determined and is equal to the pH at half equivalence. How would a more dilute strong base...
A titration is done using 1 M NaOH in the buret and 15mL of 1.8M HCL...
A titration is done using 1 M NaOH in the buret and 15mL of 1.8M HCL in the Erlenmeyer flask. How many moles of HCl are left in the flask after a total of 5mL of the 1M NaOH solution were added to the flask
Volumes and molarities for titration of CdC2O4 solutions. PART A Data Initial reading of buret (KMnO4)...
Volumes and molarities for titration of CdC2O4 solutions. PART A Data Initial reading of buret (KMnO4) (mL) 0.50 Final Reading of buret (KMnO4) (mL) 14.00 Molarity of KMnO4 solution (M) 0.000969 PART B DATA Initial Reading of buret (NH3) (mL) 1.00 Final reading reading of buret (NH3) mL 22.50 Molarity of NH3 solution (M) 5.00 FOR PART A Find: Moles of MnO4- used for titration (mol) Moles of C2O42- in 100.0mL of solution (mol) Molarity of C2O42-(M) Molarity of Cd2+...
A student collected H2 gas in a buret by displacing water at 22.0 °C. The burette...
A student collected H2 gas in a buret by displacing water at 22.0 °C. The burette could not be submerged deep enough in a water bath to equalize the pressure. The water level in the burette was 18.2 cm above the water level in the water bath. The volume of the gas in the burette was determined to be 38.6 mL. (Assume ideal behavior of H2.) A)If the atmospheric pressure was 748 mm Hg, what is the pressure of the...
An air bubble at the bottom of a lake 32.0m deep has a volume of 1.00...
An air bubble at the bottom of a lake 32.0m deep has a volume of 1.00 cm3. If the temperature at the bottom is 2.2 ?C and at the top 20.2 ?C, what is the radius of the bubble just before it reaches the surface?
An air bubble of 21 cm3 volume is at the bottom of a lake 32 m...
An air bubble of 21 cm3 volume is at the bottom of a lake 32 m deep where the temperature is 4.0°C. The bubble rises to the surface, which is at a temperature of 24°C. Take the temperature of the bubble's air to be the same as that of the surrounding water. Just as the bubble reaches the surface, what is its volume?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT