Titration of a Strong Acid and a Strong Base C-10
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1. TO i aO 8 7 6 5 4 3 2 1 0 a 2 3 Save your graph Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 8 NeuLog EF Click on the Experiment setup icon e click on the XY graph tab and choose sensor then choose drop counter You will get a graph of the pH of the solution against the added NaOH solution drops 8 7 6 5 4 3 x 1 0 4 ee 3 80 90 100 Drop counter 1 Drops Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 9 NeuLog EJ Summary questions 1 Describe the change in the pH during the measurement 2 In this experiment you have added NaOH to HCI and received a titration graph Draw a graph of what you would expect to see when an HCI solution is added to a NaOH solution oH against drops or volume 3 What was supposed to be the volume in which the rise in pH is very sharp the equivalence point Compare it to your result If there is a difference write down possible reasons for it 4 What is the average volume of each drop Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 22. This will offset the sensor to a value of 7 the value appears in the module window Wash the pH probe with the wash bottle above the plastic container and place the pH probe in the 0 05 M HCI solution Fill the burette with the NaOH solution using the Pasteur pipette up to about 1 cm above the 0 mark Put the plastic container under the drop counter open the tap and adjust the drop rate to about 1 2 drops per second Make sure that the software recognizes each drop the drops value is increasing Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 18 19 20 21 22 23 24 29 26 7 NeuLog EJ When the solution reaches the 0 mark close the tap Click on the drop counter Module setup icon K then click on the Zeroing button el Notice that the drops in the drop counter window are reset to 0 Click on the Run experiment icon to start the measurement Open the tap and adjust the drop rate to about 1 2 drops per second Gently stir the HCI solution during the measurement by moving the beaker with your hand Keep track of the volume of NaOH added to the HCI solution on your burette and also of the the pH change on the screen When you see a sharp increase in the pH write down the volume of the added NaOH solution in this stage When the pH graph becomes constant stop the experiment Your graph should be similar to the following _ 3 1O 0
3. 1 NeuLog EJ Experiment C 10 Titration of a Strong Acid and a Strong Base Objectives To study the titration process To follow changes in the pH during the titration process while adding a strong base to a strong acid To use a drop counter in order to get a pH versus volume in drops graph Modules and Sensors PC NeuLog software USB 200 module v2 NUL 206 pH logger sensor ry NUL 223 Drop Counter logger sensor Equipment and Accessories Utility stand 1 Right angle clamp 2 Extension clamp 1 Burette 1 50 ml beaker 2 250 ml beaker 1 Pasteur pipette 1 Wash bottle 1 Plastic container 1 The items above are included in the NeuLog Utility accessories UTL KIT only one right angle clamp is included Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 2 NeuLog EJ Materials 50 ml of 0 05 M HCl 1 10 ml of 0 5 M NaOH 1 Water for the wash bottle 1 30 mlofpH 7 buffer solution 1 Introduction Titration is an analytical tool to determine the concentration of an acid or basic solution It is based on the neutralization process Neutralization occurs when the hydronium ion from an acid interacts with a hydroxide ion from a base on a one to one basis forming water in the process A salt is always a byproduct of this type of reaction Titration is the progressive addition of an acid to a base or vice versa to achieve neutralization The point at which the acid and base are in equivale
4. g software functions are explained in short It is recommended to practice the NeuLog software functions as described in the user manual beforehand 6 Run the NeuLog software and check that the sensors are identified Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 5 NeuLog ES settings i 7 Click on the On line experiment icon in the NeuLog main icon bar 8 Click on the Module setup icon amp on the drop counter sensor s module box to open a dialog box Drop counter 210 Drops Module Setup ti 9 Select the Drops radio button to change the sensor s mode 10 Close the Module setup dialog box 11 Click on the Experiment Setup icon on the On line Sub icon bar and set the Experiment duration to 10 minutes sampling rate to 20 per second Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 6 NeuLog ES Testing and measurements 12 13 14 15 16 17 Unscrew the cap from the pH sensor probe wash it with water above the plastic container and put it into the pH 7 buffer make sure that the beaker does not tip over In order to offset the pH sensor make sure that the probe is in the pH buffer If the pH buffer is not available distilled water can be used instead Allow the reading to stabilize press on the sensor s Offset button continuously 3 seconds or use the Offset icon bx in the Module setup dialogue box
5. nt amounts is called the equivalence or end point One common example for acid base titration is the use of a hydrochloric acid solution HCl with a basic sodium hydroxide solution NaOH This is an example of a titration of a strong acid with a strong base In this experiment you will conduct a titration in which this reaction occurs You will determine the equivalence point and plot a pH verses volume in drops graph HCI NaOH gt H O NaCl Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 3 NeuLog EJ Procedure Experiment setup Caution Please note that the bottom part of the pH sensor consists of a fragile crystal sphere Even though it has a plastic protection be careful not to break it lt is recommended to wear personal protective equipment Material Safety Data Sheets MSDS are available online 1 Make sure you have 50 ml of 0 05 M HCI in a 250 ml beaker 10 ml of 0 5 M NaOH in a 50 ml beaker and a pH 7 buffer in another 50 ml beaker 2 Attach the burette to the utility stand with the right angle clamp and extension clamp 3 Attach the drop counter probe to the utility stand with the other right angle clamp Experiment C 10 Titration of a Strong Acid and a Strong Base Ver 3 0 2 4 NeuLog ES sensor setup 4 Connect the USB 200 module va to the PC 5 Check that the pH ry and drop counter K F sensors are connected to the USB 200 module Note The followin
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