A 50-mL Mohr buret is connected to a 1-ft length of capillary tubing. The buret is then filled with water and the volume of water versus time is monitored as the water gradually flows through the capillary tubing. This process

21,919 results
  1. acid-base titrations

    For each of the following circumstances, indicate whether the calculated molarity of NaOH would be lower, higher or unaffected. Explain your answer in each case. a.the inside of the pipet used to transfer the standard HCI solution was wet with water. b.You

  2. Chemistry

    A student failed to notice an air bubble trapped in the tip of the buret during their experiment. What effect does this have on the calculated molarity of the NaOH solution?

  3. Chemistry

    A titration setup was used to determine the unknown molar concentration of a solution of NaOH. A .025 M HCl solution was used as the titration standard. The following data were collected. Trial 1 Trial 2 Trial 3 Initial NaOH Buret Reading 0.0 mL 12.2 mL

  4. Biology

    Your lab group is experimenting with the diffusion of molecules across a membrane. Dialysis tubing is used as a model cell membrane because is it semi-permeable, allowing small molecules to cross the membrane, but NOT larger molecules, like starch. A

  5. Chemistry

    This is a lab called Enthalpy and Entropy of Borax Dissolution and I just can't seem to get the right answers... Please help me fill in the blanks The _____ (acid/HCl?)is placed in the buret and the ____ (base/borax?) is placed in the flask beneath the

  6. Chemistry

    A student collected H2 gas in a buret by displacing water at 22.0 °C. The buret could not be submerged deep enough in a water bath to equalize the pressure. The water level in the buret was 18.2 cm above the water level in the water bath. The volume of

  7. Chemistry

    The bubble in the tip of the buret is not removed prior to performing the NaOH standardization. Will the reported concentration of the NaOH be greater than, less than, or equal to the true concentration of the NaOH if the bubble is flushed from the buret

  8. APChem

    If an air bubble passes unnoticed through the tip of a buret during a titration (where a weak nonvolatile acid HA is the analyte) , the calculated molar mass of HA would be too high, too low, or not affected? I thought it would be too high, since an air

  9. CHEMISTRY

    If you use a dirty buret, the titrant leaves drops of solution behind as the meniscus descends during delivery of the solution. The volume actually delivered by the buret will be __________ the volume your readings of the buret scale indicate was delivered

  10. CHEMISTRY PLEASE HELP

    Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading:

  11. Chem 151

    Would my calculated molarity of HOAc in vinegar be too high, low, or unchanged if a) i forgot to rinse wet buret with vinegar b)delivered vinegar into a wet flask c)used a buret with a broken tip Any help please!!!

  12. chemistry

    When filling the buret with NaOH solution, you left an air bubble in the buret tip. The bubble was released durning your first KHP titration. Would the following technique error result in an erroneously high or reeoneously low calculated molarity of NaOH

  13. Chemistry

    Can someone check my answers? These are based off of an experiment which is determining the proportionality constant, R, in the ideal gas equation. 1. Suppose a student runs into some procedural and calculation difficulties. State the effect the following

  14. Chemisty

    Based on the standard analytical practice during a titration of taking pH-volume measurements every 0.3 pH units, how many measurements should you take between the addition of 5mL and 7.5mL of titrant, a) in the titration of a 10mL aliquot of standard

  15. chemistry

    A 15.00 mL sample of an unknown monoprotic weak acid solution is titrated with 0.35 M NaOH. The initial buret reading is 0.23 mL. The phenolphthalein indicator turns the solution light pink when the buret reads 29.58 mL. A. what volume of 0.35 M NaOH was

  16. chemistry

    So i had trouble finding the answers to these questions on a lab: Background: If we were using a burret/flask instead of a pipette and well plates. Before you started, the buret must be rinsed with 1 ml of distilled water and then 1 ml of NaOH solution.

  17. AP Chemistry

    A solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.234 g; buret reading before titration 0.23 mL; buret

  18. science

    Does adding boiled, deionized water to the titrating flask to wash the wall of the erlenmeyer flask and the buret tip increase, decrease, or have no effect on the Ksp value of the Ca(OH)2?

  19. chemistry

    HCl is titrated with NaOH. When doing the titration, some of the NaOH splashed onto the inside surface of the Erlenmyer flask, and you forgot to rinse it into your sample. Would the systematic error be falsely high, low, or unaffected and why? Thanks. As I

  20. Chem

    a solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.054 g; buret reading before tiltration 0.33 mL; buret

  21. Chemistry Lab Work Help!

    We used a buret today, and I don't get how to calculate volume. I have an initial reading of 49.97 and a final buret reading of 30.49. How do I get the volume? I thought I just subtracted the final from the initial, but someone said their tutor told them

  22. chemistry help

    A 15.00 mL sample of an unknown monoprotic weak acid solution is titrated with 0.35 M NaOH. The initial buret reading is 0.23 mL. The phenolphthalein indicator turns the solution light pink when the buret reads 29.58 mL. B. How many moles of NaOH were

  23. chemistry

    What indicator would be used if we were titrating with HCl in the buret and NaOH in the flask since phenolphthalein is not appropriate?

  24. chemistry

    I need some help with calculating percent yield and percent purity of aspirin. Here's my data (questions follow): SYNTHESIS Mass of salicylic acid.., 2.0 g Volume of acetic anhydride.., 5 mL Mass of watch glass.., 22.10 g Mass of aspirin and watch glass..,

  25. college

    If a 0.5 -mL air bubble is persent in the tip of a buret, what error in 10-mL,20 m l and 40-mL samples will result if the air bubble is dislodged during the dispensing of the sample?

  26. Chemistry

    A buret is partially filled with NaOH solution, to a volume of 1.14 mL. A 20-mL sample of 0.1011 M HCl is titrated to a faint pink phenolphthalein endpoint. The final buret reading is 22.37 mL. What is the molartiy of the NaOH solution?

  27. chemistry

    A volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.22 ml?

  28. Chemistry

    A volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.30 ml? [assume the density of water is 1.00g/mL]

  29. Chemistry

    The following data came from a titration experiment. A student titrated 10.00 mL samples of Na2SO4 with 0.350 mol/L HBr -------------------------------------------------------------------------------------------- Trail | 1 | 2 | 3 | 4 |

  30. CHM Lab

    Calibration of a 50 ml buret (10 ml,15 ml,20ml, 25 ml,30ml,35ml,40ml,45ml,50ml)(repeated the procedure 3 times) for experimental ; i have observed vol(ml) , temp.C ,for true i have mass(g), true vol. ml and for calibration i found error ml /correction

  31. Chemistry

    A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP....? A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP, with 0.163 M NaOH solution. She recorded an initial buret reading of 0.84 mL and

  32. Chemistry

    A 50-mL Mohr buret is connected to a 1-ft length of capillary tubing. The buret is then filled with water and the volume of water versus time is monitored as the water gradually flows through the capillary tubing. This process is found to be first-order

  33. Chemistry

    A buret is partially filled with NaOH solution, to a volume of 1.14mL. A 20-mL sample of 0.1011 M HCl is titrated to a faint pink phenolphthalein endpoint. The final buret buret reading is 22.37mL. What is the molarity of the NaOH solution? Please help.

  34. Chemistry - Titrations

    This is one of those titration labs, maybe you could answer it? Why must a buret be rinsed with NaOH solution before it is filled and not water? Note: ( Buret will be full of NaOH )

  35. Chemistry

    Can you find me a sample data of the experiment on the standardization of a basic solution, NaOH? (with initial and final readings for HCl buret and NaOH buret)

  36. Chemistry

    A buret (initial and final buret reading were 2.20 mL and 11.86 mL) was used to deliver a sample of 2.1E-5 M stock dye into a 25.0 mL volumetric flask. The dye was then diluted with water to exactly 25.0 mL. Calculate the molarity of the resulting

  37. chemistry

    15.00 ml of NaOH is obtained in an Erlenmeyer flask. Before titrating with .2500 M HCl, the initial volume of acid in a buret is read as 2.08 ml. At the endpoint the final volume of acid in the buret is 25.20 ml. What was the concentration of NaOH?

  38. Chemistry

    So i had trouble finding the answers to these questions on a lab: Background: If we were using a burret/flask instead of a pipette and well plates. Before you started, the buret must be rinsed with 1 ml of distilled water and then 1 ml of NaOH solution.

  39. science(chem)

    Situation: KMnO4 solution left in buret for awhile...would it be okay to go and titrate with the same solution left in the buret later? And if solution is discarded and refilled later wouldn't the solution go and react with the light thus contaminating the

  40. science-chem- theory questions

    please, help me.. i think i know the answers, but i just want to make sure! i'd love your feed back :) 1) an air bubble is trapped in the tip of a buret before a titration. during the titration, the bubble is passed from the buret tip. will the reported

  41. chemistry

    What volume of solution should be dispensed from the buret to provide 3.718 mmol CO3 2-? answer in units of mL.

  42. Biology Diffusion

    This is what i read from wikipedia: "Dialysis tubing is not permeable to glucose." Is that true? Visking tubing (Dialysis tubing) DOES allow glucose molecules to pass through it right?? So what types of molecules can pass through visking tubing? Can

  43. Chemistry

    Accurately weigh 0.9-1.1 g into a 200 mL beaker. Dissolve the KIO3 in a small amount of distilled water. Quantitatively transfer, with rinsing, to a 500 mL volumetric flask. Dilute to the calibration mark and shake well. Rinse the buret several times with

  44. Chemistry

    What improvements could i make to this lab? so far i only have that the graduated cylinder should be changed to a buret for a more accurate measurement. Procedure: Part 1 Begin by measuring the mass of the empty calorimeter and record the value. Next, add

  45. chemistry

    Calculate the concentration of a solution prepared by adding 15.00 mL of 1.92E−3M KMnO4 from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water.

  46. phsicsy

    a liquid with density of 1.36*10^3 kg/m^3 through two horizontal sections of round tubing joined end to end. in first section, diameter of the tubing is 10cm and the flow speed is 230cm/s and the pressure is 1.3*10^5, the diameter is 6 cm a the cross

  47. chem SCC 151

    10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.110 M NaOH. What was the initial concentration of HCl?

  48. Chemistry

    Can someone check my answers? These are based off of an experiment which is determining the proportionality constant, R, in the ideal gas equation. 1. Suppose a student runs into some procedural and calculation difficulties. State the effect the following

  49. Bioanalytical Chemistry

    Two proteins are separated by capillary electrophoresis. The two proteins have the following physical characteristics: Protein A: net charge = +6; MW = 64,500; partial specific volume = 0.700 cm3 / g Protein B: net charge = +3; MW = 35,000; partial

  50. Chemistry

    For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass

  51. chemistry

    Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide. Materials are: *50.0 mL of 0.10 M HCl(aq) *bromophenol blue indicator *50.0 mLsaturated calcium hydroxide *50.0 mL buret *125 mL Erlynmyer Flask *50.0 mL of distilled

  52. Chemistry

    A 50-mL Mohr buret is connected to a 1-ft length of capillary tubing. The buret is then filled with water and the volume of water versus time is monitored as the water gradually flows through the capillary tubing. This process is found to be first-order

  53. chemistry

    A 50-mL Mohr buret is connected to a 1-ft length of capillary tubing. The buret is then filled with water and the volume of water versus time is monitored as the water gradually flows through the capillary tubing. This process is found to be first-order

  54. Analytical CHM Lab

    I am filling out my neutralization titration data sheet and i did not understand how to find buret correction (ml) and corrected volume(ml) and Molarity of NaOH without buret correction and as well as with buret correction. in the lab we have used 50 ml of

  55. CHM

    rank the following items in order of accuracy when they are used for their intended purpose: volumetric pipet, beaker,erlenmeyer flask,mohr pipet,graduated cylinder,volumetric flask,buret my answer MOHR PIPETTE 1 VOLUMETRIC PIPETTE 2 BURET 3 VOLUMETRIC

  56. chemistry

    Why is it important to make sure there are no air bubbles in the tip of a buret below the stopcock before using the buret to dispense a solution? What would be the % error if there were a 0.5 mL air bubble in the tip of a buret, and this air bubble was

  57. Chemistry

    A student collected H2 gas in a buret by displacing water at 22.0 °C. The buret could not be submerged deep enough in a water bath to equalize the pressure. The water level in the buret was 18.2 cm above the water level in the water bath. The volume of

  58. chemistry about buret

    In the experiment of buret calibration, what is the importance of having total buret correction? And does the density of the water at a specific temperature affect this corrections?

  59. Chem

    When you are ready to record the total collected volume of hydrogen gas, it is only necessary to subtract the buret scale reading from 50.00, then add Vsmall subtract Vsmall from the buret scale reading record the buret scale reading add Vsmall to the

  60. chemistry

    calculate the morality of THE H2SO4 solution for each of the three runs. do the three values agree closely together with each other. Part A. Titration 1 volume of unknown acid =20ml initial buret reading of NaOH =0.5 ml final buret reading of NaOH=10.0ml

  61. CHEMISTRY

    How do you get the concentration with buret readings? What would the concentration of HC2H3O2 (M) be? For example, Molarity of the NaOH solution: 0.2619 M Final buret reading: 31.10 ml Initial buret reading: 0 Volume of NaOH solution: 31.0 ml concentration

  62. chemistry

    calculate the morality of THE H2SO4 solution for each of the three runs. do the three values agree closely together with each other. Part A. Titration 1 volume of unknown acid =20ml initial buret reading of NaOH =0.5 ml final buret reading of NaOH=10.0ml

  63. Chemistry

    Consider titrating an unknown chloride sample with 0.10 +/- 0.01M AgNO3 and the following data: Initial Buret reading-0.19 +/- 0.02mL Final Buret reading- 9.26 +/- 0.03mL Unknown sample mass- 95.0 +/- 0.2mg Find the weight 5 of Cl- in the sample.

  64. Analytical CHM

    Rank the following items in order of accuracy when they are used for their intended purpose: Volumetric pipet, beaker, Erlenmeyer flask, MOHR pipet, graduated cylinder, volumetric flask, buret. Explain your asnwer below Most accurate 1. 2. 3. 4. 5. 6.

  65. chemistry

    A volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.12 ml? [assume the density of water is 1.00g/mL]

  66. chemistry lab

    A volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.10 ml? [assume the density of water is 1.00g/mL]ml

  67. math

    volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.10 ml? [assume the density of water is 1.00g/mL]

  68. chemistry

    A volume of water delivered using a buret has a mass of 5.15 g. What was the final volume reading on the buret if the inital volume reading was 0.70 ml? [assume the density of water is 1.00g/mL]

  69. chemisty

    volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.10 ml? [assume the density of water is 1.00g/mL]

  70. chemistry

    You perform the following titration: You placed 35 mL of H2S in a flask and placed it under a buret. The buret contains 0.243M Sr(OH)2 and you are going to titrate the H2S with the base. You titrate until the color changes. At that point, you record that

  71. CHEMISTRY

    a solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.404 g; buret reading before titration 0.13 mL; buret

  72. chemistry

    A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.744 g; buret reading before titration 0.13 mL;

  73. Chemistry

    A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.654 g; buret reading before titration 0.23 mL;

  74. AP chemistry

    A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.894 g; buret reading before titration 0.13 mL;

  75. AP Chemistry

    So i had trouble finding the answers to these questions on a lab: Background: If we were using a burret/flask instead of a pipette and well plates. Before you started, the buret must be rinsed with 1 ml of distilled water and then 1 ml of NaOH solution.

  76. Chemistry

    Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading:

  77. chemistry

    A volume of 12.47 mL of 0.1080 M NaOH solution was used to titrate a 0.583 g sample of unknown containing K2HPO4. What is the percent by mass of K2HPO4 in the unknown? In this problem what mass of sample in grams would be needed to deliver about 23.40 mL

  78. Chemistry

    ANYTHING WILL HELP. THANK YOUU!! A student titrates 50mL apple juice and reports the following in the titration to the phenolphthalein end point with .1011M NaOH final buret reading:17.86mL initial buret reading:1.47 A)What is the concentration of the

  79. Chemistry

    ANYTHING WILL HELP. THANK YOUU!! A student titrates 50mL apple juice and reports the following in the titration to the phenolphthalein end point with .1011M NaOH final buret reading:17.86mL initial buret reading:1.47 A)What is the concentration of the

  80. Chemistry

    For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass

  81. Chemistry(Please help!!)

    For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass

  82. ANALYTICAL CHM

    What are the possible sources of error in using a graduated pipet? in using a buret?

  83. Chem 125

    Three bulbs are connected by tubing, and the tubing is evacuated. The volume of the tubing is 27.0 mL. The first bulb has a volume of 37.0 mL and contains 5.65 atm of argon, the second bulb has a volume of 250 mL and contains 2.16 atm of neon, and the

  84. Chem.

    How many milliliters of water has been dispensed if the initial buret reading was 0.38 ml and the final is 24.70 ml?

  85. chemistry

    How many milliliters of water has been dispensed if the initial buret reading was 0.45 mL and the final is 20.33 mL?

  86. Chemistry

    How many milliliters of water has been dispensed if the initial buret reading was 0.38 ml and the final is 24.70 ml

  87. Chemistry

    Why is it necessary to use a buret for measuring standard silver nitrate solutio ( volhard)

  88. ANALYTICAL CHM

    Describe the correct technique for reading the meniscus of a solution in the buret.

  89. chemistry

    Propose methods for protecting the sodium hydroxide solution in the bottle and the buret from exposure to carbon dioxide in the air.

  90. chemistry

    If a 200-mm test tube is substituted for the gas buret in this experiment(It is a Aluminum Analysis ) ,indicate the additional measurements you will make .

  91. Chemistry

    A student weights 1.700 g of succinic acid and dissolves it in water in a 250.0 mL volumetric flask. A 25.00 mL sample of this solution is withdrawn and placed in a 125 mL Erlenmeyer flask, to which 5 drops of the acid-base indicator phenolphthalein is

  92. Chemistry(Please help, thank you!)

    For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass

  93. Chem: please help

    Calculate the concentration of a solution prepared by adding 15.00 mL of 2.10 X 10^-3 M KMnO4 from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water.

  94. Chemistry help!!

    Calculate the concentration of a solution prepared by adding 15.00 mL of 2.10 X 10^-3 M KMnO4 from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water.

  95. 7th Math

    A plumber must bend a piece of tubing twice, allowing 5/8 inch for each bend. use the total of 12 1/2, 16 3/4, and 18 3/4. To find the total length of tubing needed?

  96. chemistry

    So I did a titration lab at school with NaOH and HCl. i have to find: - volume used, NaOH - Moles of NaOH - Moles of HCl -Volume used unknown HCl - Molarity of HCl solution My concentration of NaOH stock solution was 0.100 mol/lL Final buret reading, NaOH:

  97. science

    how grams it would take to fill the buret to 35mL? is this would take more or less than for butane? what do you think causes this value to be different from the value for butane?

  98. chemistry

    Can you help me with the following: Calculate the pH that results when 25 mL of .1M HCL is titrated with .1M NaOH solution run in from a buret at each of the stages of volume of .1 M NaOH add in 5.0 mL incrememnts beginning with 0 mL of NaOH

  99. math

    a man paid $8.50 for a small pump and 8 feet of tubing.he paid 12 times as much for the pump as for each foot of tubing.how much did the pump cost? the tubing?

  100. chemistry .....please help

    Which of the following statements does not apply to water? A. Like all liquids, water assumes the shape of its container. B. Water is a polar molecule. C. The strong surface tension of water allows it to adhere to the sides of a container and actually move

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