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Distinguish the terms end point and equivalence point.
Equivalence point comes before the end point. At equivalence point, the number of moles of titrant and analyte becomes equal. While at the end point, there is a color change to change the titration.
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- 10-27. A 10.231-g sample of window cleaner containing ammonia was diluted with 39.466 g of water. Then 4.373 g of solution were titrated with 14.22 mL of 0.106 3 M HCl to reach a bromocresol green end point. (a) What fraction of the 10.231-g sample of window cleaner is contained in the 4.373 g that were analyzed? (b) How many grams of NH3 (FM 17.031) were in the 4.373-g sample? (c) Find the weight percent of NH3 in the cleaner.How does an end point differ from an equivalence point?Explain how the concentration of the analyte is computed using the concentration of the analyte consumed in the titration.
- Solution 1 Solution 2 Solution 3 Solution 4 Solution 5 Concentration iron(III) nitrate 0.00200 0.00200 0.00200 0.00200 0.00200 [Fe(NO3)3] (M) Concentration potassium thiocyanate 0.00200 0.00200 0.00200 0.00200 0.00200 [KSCN] (M) Volume Fe(NO3)3 (mL) 5.00 5.00 5.00 5.00 5.00 Volume KSCN (mL) 5.00 4.00 3.00 2.00 1.00 Volume DI water (mL) 0.00 1.00 2.00 3.00 4.00 Initial concentration [Fe3+] (M) 0.00100 0.00100 0.00100 0.00100 0.00100 Initial concentration [SCN] (M) 0.00100 0.000800 0.000600 0.000400 0.000200 Absorbance 0.269 0.192 0.154 0.104 0.052 Equilibrium [FeSCN2+] (M) 0.000198 0.000141 0.000113 0.0000765 0.000038 Equilibrium constant Kc Average KcThe student added universal indicator to the alkali solution at the start of the experiment. The indicator changed colour when the acid was added to the alkali. Explain how the student used this information and the pH scale to explain that this is a neutralisation reaction.(b) Suppose the laboratory Technician carried out the same titration experiment in which he/she recorded an average volume of 20 cm³ of the dilute hydrochloric acid (HC) by titrating with 0.05 mol dm³ and 25 cm³ of potassium hydroxide (KOH). Calculate the concentration of hydrochloric acid from the Technician's experiment.
- 7-43. Supply the missing data in the table below. Molar Analytical Concentration, c- Acid (Ct = CHa + Ca-) pH (HA] [A^] Lactic 0.120 0.640 Iodic 0.200 0.765 Butanoic 5.00 0.0644 Hypochlorous 0.280 7.00 Nitrous 0.105 0.413 0.587 Hydrogen cyanide Sulfamic 0.145 0.221 0.250 1.20What is the difference between the equivalence point and the end point.Colligative properties of a solution are mostly determined by— degree of polarity of the solute. degree of polarity of solvent. concentration of solute. dielectric constant of the solvent. its temperature.
- As part of the analysis of water samples, the hardness of water is commonly measured and calculated. It is commonly expressed in ppm by mass (parts per million) of CaCO3. Parts per million is also equivalent to milligrams of CACO3 per liter of water. In a sample taken by an environmentalist, he was able to observe a hardness count of 205 mg CacO3/L. Given this hardness count of the sample, what is the molar concentration of Ca2+ ions in the water sample?What is the application of qualitative chemistry in refining crude oil.For the CO2 impact experiment station: 1) Obtain two plastic cups, red cabbage indicator, a straw, and plastic wrap. 2) Fill each cup approximately one-quarter to one-third full of tap water and add ~10 mL of the red cabbage indicator. 3) Place the two cups side by side on a sheet of white paper. 4) Place the straw into one of the beakers and cover that beaker with the plastic wrap. 5) Carefully blow bubbles into the test cup for 3 min. and observe both cups. 6) Compare the color to the control cup and record any differences. This the Question: Did the beaker with the solution into which CO2 was bubbled change pH/color? By how much? Is this what, you would predict, based on your knowledge of the chemistry of CO2?
