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Sulfurous acid, H2SO3, is a weak diprotic acid (pKa,1=1.89 and pKa,2=7.21 at 25oC). What is the pH of 0.121 mol/L H2SO3(aq) at 25oC
What volume of ether would be required to extract 0.95 g of aspirin from a solution of 1.0 g of aspirin in 100 mL of water in a single extraction
What is the percent ionization of HA in 0.11 mol/L HA(aq) if HA is a weak acid with pKa=6.00. Enter your answer accurate to three significant figures
What practical advantage does an extraction solvent that is denser than water have over one that is less dense
A sound wave from a police siren has an intensity of 103.1 W/m2 at a certain point; find the intensity level of the sound wave due to the ambulance?
In a constant pressure calorimeter 25 mL of 1.0M NaOH reacts with 250 mL of 1.0M HCl and the temperature increases 6.0 degree celsius. What is the enthalpy of this reaction?
A 300-kg elevator is raised with a constant speed through a vertical distance of 100 m in two minutes. What is the useful output power of the hoist
An 85 kg linebacker is running at 8 m/s directly toward the sideline of a football field. Determine their common speed and direction immediately after they collide
limiting Reactant Worksheet - What are the two steps in the Experimental Procedures that are incorporated to reduce the loss of the calcium oxalate precipitate. Identify the steps in the procedure a
A penny sits 20 cm from the axis on an old record, which is spinning at 45 rpm. find the coefficient of friction between the penny and the record
Which of the following solutions has the highest osmolarity. 1.1 M Ba(OH)2 .75 M Fe2(SO4)3
1) Draw the form (structure) of ascorbic acid that is present at physiological pH (in the body; pH= 7.4). What diseases can be prevented and/or treated by the intake of ascorbic acid?
flash decides to make a capacitor at homes. Flash takes two thin, flat, rectangular aluminum plates measuring 35 cmby 50 cm. find the capacitance of flash's creation
Draw the polymer that results from phthalic anhydride and glycerol. d. Are these addition or condensation polymers? e. Describe and explain the differences between the polymers formed from the react
A very long, thin straight line of charge has a constant charge density of 20 pC/cm. How far does the electron go before it comes back
The choice of nominee appropriate? (ie. don't nominate a non-biotech person) and is the format correct? (font, spacing, margins 5 pages total, etc.)
The International Space Station orbits at a distance of 355 km above the surface of the Earth. What is the gravitational acceleration it experiences
Write out the balances for the mixing point d) Determine he amount of desalinated water (D) produced, e) Determine the amount of waste brine (B) from the process, and f) Determine the fraction of th
A solid cylindrical disk has a radius of 0.45 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. What is the mass of the disk
What is the solubility of lead(II) chloride in both hot and cold water? why is the use of hot water critical to the sucess of the experiment
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 159-kg laser sensor which measures the thickness of the ice, find the tension in the cable towing the sensor
We do not have any gardening books, magazines, or access to the Internet (horrors!). We need to observe a number of characteristics for these plants. What are some of the characteristics that we wan
A piano tuner hears one beat every 3.1 seconds when trying to adjust two strings, one of which is sounding 440 Hz, How far off in frequency is the other string
If the plane does 2.00 x 105 J of work to tow the glider 155 m and the tension in the tow rope is 2460 N , what is the angle between the tow rope and the horizontal
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. Estimate the length of the lake