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The epidemiology of the spread of disease through bodily fluids can easily be demonstrated using small cups of water given to several people, one of whose contains the base sodium hydroxide (NaOH) which appears no different than water itself. To simulate interaction of bodily fluids, each person exchanges the liquid in their cup with three other individuals. After the exchange, the indicator phenolthalein is added to each person's cup and the appearance of bright pink indicates that the fluid in their cup was exchanged with the "diseased" fluid containing sodium hydroxide. To complete the demonstration, hydrochloric acid is added to the bright pink cups to simulate "a cure" until the liquid turns clear again.
Explain what chemical reactions occurred, what was the indicator detecting, and why did the color go away after the addition of hydrochloric acid. How does this demonstration relate to the titration performed in the lab?
Question- Construct a rough plot of pH versus volume of added base for the titration of 50 mL of 0.055 M HCN with 0.075 M NaOH. Ka = 4.0*10-10 for HCN.
In the boron trifluoride etherate-catalyzed reaction of acetic anhydride and salicylic acid to produce acetylsalicylic acid, or aspirin, anhydrous conditions prevail. So, what serves as the base, as water cannot?
What is the molality of a solution of 50.0 g of propanol(C3H7OH) in 752 mL water if the density of water is 1.00g/mL
How many moles of naoh do you have to add to the solution in part a so that the ph will increase by 0.2?
Problem- Movement of ammonia from an amino acid to an alpha-keto acid involves a family of enzymes best categorized as
A solution is initially 0.100 M in HOCl and 0.300 M in NaOCl. What is the pH if 0.030 mol of solid NaOH is added to 1.00 L of this solution
It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.5 times as many moles of CO2 as of water. Find the mass of C2H2 in the original mixture.
Calculate the number of moles of HCl that would be consumed by 1.0 g of NaHCO3
The temperature inside a pressure cooker is 1150C. Calculate the vapor pressure of the water inside the pressure cooker.
The standard free energy of the reaction represents the drive the reaction has under standard conditions to move toward equilibrium. Express the equilibrium constant numerically using three significant figures.
Nitrogen reacts with a metal to form a compound in which there are three atoms of the metal for each atom of nitrogen. If 1.486 g of the metal reacts with 1.000 g of nitrogen
a tightly sealed 5 litres flask has argon ar at 6.28x101 deg. c and 781 mm hg. determine the temperature of the gas if
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