What is the volume of a 0.5 mol / LNaOH solution required to completely react wi

Question

What is the volume of a 0.5 mol / LNaOH solution required to completely react with 20 mL of a 2.0 mol / L HCI solution? What is the pH value of the produced solution? ( Write and balance the chemical reaction between HCI and NaOH, and then use the stoichiometric relation (molar relation) between NaOH and HCI to calculate the minimum volume of NaOH solution.) Normally, we use one hand to control the stopcock to add titrant, and the other hand to swirl the Erlenmeyer flask at the same time. For beginners, you could do it slowly by adding small amount of titrant each time followed by swirling the Erlenmeyer flask after each addition. Which of the following is NOT the reason that you need to swirl the Erlenmeyer flask? It helps to mix the two solutions quicker. It helps to get an accurate end-point. So the end point is closer to the equivalent point. The solution won't spill. Swirling helps to mix the titrant and analyte well. Use the following link to run the simulation of titrating 25 mL of a 0.1 mol/ L HCI solution with a 0.2 mol/L NaOH solution. As you may notice, HCI solution is in the Erlenmeyer flask, and NaOH solution is in the buret. Which is the best indicator for this titration? With this indicator, what is the volume of NaOH added when the titration curve shows the equivalent point? And what is the volume of NaOH added when the titration reaches the end point (solution changes color)? ( At first, you could add large quantity of NaOH solution each time. When the titration is close to the end point, reduce the amount to 0.1 mL, and even to 0.05 mL for each addition until you see the equivalent point on the titration curve and a color change in the Erlenmeyer flask. Then, you could add large quantity of NaOH to generate the whole titration curve.) http://people.okanagan.bc.ca/cdoige/Presentation_Simulations/titration_cun/es_s.html Phenolphthalein, 12.5 mL, 12.55 mL Chlorophenol red, 10.5 mL, 12.55 mL Methyl orange, 12.5 mL, 11.3 mL Bromocresol green, 12.5 mL, 12.2 mL Phenolphthalein, 25 mL, 12.55 mL Why are volumetric flasks, instead of beakers or graduated cylinders, used to prepare standard solutions from solids? Volumetric flasks are easier to handle than beakers or graduated cylinders. Beakers and graduated cylinders are not large enough to prepare a large volume of standard solution. Volumetric flasks are calibrated to contain a precise volume of liquids at a particular temperature. There are volumetric flasks with various sizes for us to choose from. Volumetric flasks are cheaper than beakers and graduated cylinders.

Explanation / Answer

ANSWERS:

1. It is one fourth the strength , so you need four times the volume for neutralization.

Ans: 80mL, pH is 7

2. Ans: The solution won't spill

3. Ans: Phenolphthalein, 12.5 mL, 12.55

4. Ans: Volumetric flask are caliberated to contain a precise volume of liquids at a particular temperature.

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