Homework Answers
This reaction is known as clock reaction..at some interval of time we add thiosulphate from burette and the blue color is gone but after sometime when thiosulphate is again consumed by hydrogenperoxide then again color reappears..so thio is more consumed than hydrogen peroxide...always do stop watch while do this reaction
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2. When does the color of the solution change from colorless to blue? During the elapsed...
Addition of phenolphthalein to an unknown colorless solution does not cause a color change. The addition...
Addition of phenolphthalein to an unknown colorless solution does not cause a color change. The addition of bromthymol blue to the same solution leads to a yellow color. Is the solution acidic, neutral, or basic? Which of the following can you establish about the solution: What other indicator or indicators would you want to use to determine the pH of the solution more precisely?
Which CSS attribute would change an element's font color to blue? 1- font-color: blue; 2- background:...
Which CSS attribute would change an element's font color to blue? 1- font-color: blue; 2- background: blue, 3- color: blue: 4- background-color: blue; 5- font: blue;
when bromothymol blue was exposed to carbon dioxide what color was the solution? Does this mean...
when bromothymol blue was exposed to carbon dioxide what color was the solution? Does this mean you had an acid or a base? why?
An unknown solution gives the following sequential results for color when indicators are 3. added (shown...
An unknown solution gives the following sequential results for color when indicators are 3. added (shown below). Using the corresponding color ranges from the table on page 2, estimate the approximate pH range of this unknown solution. Explain. नी (cnge 3.0-46 Bluish purple Bromphenol blue: 4.2-6.8 Yellow Methyl Red: 60-76 Blue Bromothymol Blue: 2.3-10-0 Colorless Phenolpthalein: 2. Sketch a titration curve for the titration of 50 mL of 0.10 M NaOH as 0.1 M HCl is added to it. Label...
The calmagite indicator changes from a pink to a blue color during the titration. Describe why...
The calmagite indicator changes from a pink to a blue color during the titration. Describe why the color change occurs. This question is part of the experiment "determination of water hardness", and you should answer the question based on the following background information(abstract information and you can get the answer). In this titration Calmagite is used an indicator for both calcium and magnesium. The equation below shows the competition reaction between the calmagite indicator (In) and EDTA for Mg and...
A reaction is run by mixing a clear, colorless solution with a second blue, clear solution....
A reaction is run by mixing a clear, colorless solution with a second blue, clear solution. The mixture is cloudy and purple. Based only on these observations, how would you classify this reaction? O Combustion reaction Single replacement reaction O Precipitation reaction O Oxidation-reduction reaction O Double replacement reaction In a calorimetry experiment, a 40.4g piece of metal at 117.°C is put into a cup of cool water that has 99.8 g of water in it. The water is initially...
n a pink aqueous solution of potassium permanganate, faintly addified with dilute sulfuric acid was treated the reaction took place with the evolution of gas bubbles, and the pink solution turned...
n a pink aqueous solution of potassium permanganate, faintly addified with dilute sulfuric acid was treated the reaction took place with the evolution of gas bubbles, and the pink solution turned colorless. Further chemical analysis revealed that the evolved gas was oxygen, and the resulting solution contains potassium sulfate and manganese () sulfate; water was also formed during the same reaction. Please with 10% aq. hydrogen peroxide, answer the followings: 1) Write down the balanced chemical equation for this reaction....
2. Consider the following equilibrium: Cu2+(aq) pale blue + 4NH3(aq) +[Cu(NH3)4]2+ (aq) colorless deep purple Would...
2. Consider the following equilibrium: Cu2+(aq) pale blue + 4NH3(aq) +[Cu(NH3)4]2+ (aq) colorless deep purple Would you expect to see an increase, no change, or a decrease in the purple color when: (a) the temperature of the system is increased (the reaction is endothermic). (b) a catalyst is added. (c) more aqueous NH3 is added to the equilibrium. (d) the pressure is increased. NaOH(aq) is added to the system, resulting in the precipitation of Cu(OH)2(s). _(1) (f) the volume of...
8) An acid (1.5pts) produces hydroxide ions when dissolved in water. donates protons in a proton...
8) An acid (1.5pts) produces hydroxide ions when dissolved in water. donates protons in a proton transfer reaction. does none of the above. donates electrons in an electron transfer reaction. changes the color of phenolphthalein indicator from colorless to pink. 9) A base (1.5pts) produces hydrogen ions in solution. donates a proton in a proton transfer reaction. causes phenolphthalein indicator to change from colorless to pink. accepts electrons in an electron transfer reaction. does none of the above. 10) Which,...
anvas D Question 1 2 pts The entropy change in a system (ASpo) during a spontaneous...
anvas D Question 1 2 pts The entropy change in a system (ASpo) during a spontaneous process must be greater than zero O less than zero. O greater than or equal to zero O equal to zero. O greater than, less than, or equal to aero D Question 2 2 pts Which of the following statements is a valid definition of entropy? O it is a measure of the average kinetic energies of the particles in a system It is...
An unknown solution gives the following sequential results for color when indicators are 3. added (shown below). Using the corresponding color ranges from the table on page 2, estimate the approximate pH range of this unknown solution. Explain. नी (cnge 3.0-46 Bluish purple Bromphenol blue: 4.2-6.8 Yellow Methyl Red: 60-76 Blue Bromothymol Blue: 2.3-10-0 Colorless Phenolpthalein: 2. Sketch a titration curve for the titration of 50 mL of 0.10 M NaOH as 0.1 M HCl is added to it. Label...
A reaction is run by mixing a clear, colorless solution with a second blue, clear solution. The mixture is cloudy and purple. Based only on these observations, how would you classify this reaction? O Combustion reaction Single replacement reaction O Precipitation reaction O Oxidation-reduction reaction O Double replacement reaction In a calorimetry experiment, a 40.4g piece of metal at 117.°C is put into a cup of cool water that has 99.8 g of water in it. The water is initially...
n a pink aqueous solution of potassium permanganate, faintly addified with dilute sulfuric acid was treated the reaction took place with the evolution of gas bubbles, and the pink solution turned colorless. Further chemical analysis revealed that the evolved gas was oxygen, and the resulting solution contains potassium sulfate and manganese () sulfate; water was also formed during the same reaction. Please with 10% aq. hydrogen peroxide, answer the followings: 1) Write down the balanced chemical equation for this reaction....
2. Consider the following equilibrium: Cu2+(aq) pale blue + 4NH3(aq) +[Cu(NH3)4]2+ (aq) colorless deep purple Would you expect to see an increase, no change, or a decrease in the purple color when: (a) the temperature of the system is increased (the reaction is endothermic). (b) a catalyst is added. (c) more aqueous NH3 is added to the equilibrium. (d) the pressure is increased. NaOH(aq) is added to the system, resulting in the precipitation of Cu(OH)2(s). _(1) (f) the volume of...
8) An acid (1.5pts) produces hydroxide ions when dissolved in water. donates protons in a proton transfer reaction. does none of the above. donates electrons in an electron transfer reaction. changes the color of phenolphthalein indicator from colorless to pink. 9) A base (1.5pts) produces hydrogen ions in solution. donates a proton in a proton transfer reaction. causes phenolphthalein indicator to change from colorless to pink. accepts electrons in an electron transfer reaction. does none of the above. 10) Which,...
anvas D Question 1 2 pts The entropy change in a system (ASpo) during a spontaneous process must be greater than zero O less than zero. O greater than or equal to zero O equal to zero. O greater than, less than, or equal to aero D Question 2 2 pts Which of the following statements is a valid definition of entropy? O it is a measure of the average kinetic energies of the particles in a system It is...
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