A sodium selective electrode indicates a 34.2 mV response to a 2.50 x 10-4 M Na+ standard solution. Assuming ideal electrode response, what is the sodium concentration of a sample when the electrode indicates a 35.2 mV response?
August 12, 2013
A water sample was analysed using a sodium selective electrode. The electrode response was 75.0 mV. A 10.00 mL aliquot of standard 0.50 mmol/L NaCl solution was added to 10.00 mL of water sample. The well-mixed solution gave a response of 98.0 mV. What is the concentration of ...
August 12, 2013
What is the molarity of the acetic acid if 0.5ml of a vinegar solution has been titrated with the 0.101M solution of NaOH and the volume of the NaOH solution at the equivalence point is 5.0mL?
May 13, 2013
At a fabrication plant, a hot metal forging has a mass of 66.8 kg and a specific heat capacity of 437 J/(kg C°). To harden it, the forging is quenched by immersion in 785 kg of oil that has a temperature of 25.0 °C and a specific heat capacity of 2770 J/(kg C°). ...
April 28, 2012
A room has a volume of 164 m3. An air-conditioning system is to replace the air in this room every 26.8 minutes, using ducts that have a square cross section. Assuming that air can be treated as an incompressible fluid, find the length of a side of the square if the air speed ...
April 15, 2012
A ball is thrown vertically upward with a speed of 27.9 m/s from a height of 1.9 m. How long does it take to reach its high- est point? The acceleration of gravity is 9.81 m/s2. Answer in units of s
September 28, 2011
Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.2L of water upon warming from 25C to 50C . Assume that the water is initially saturated with nitrogen and oxygen gas at 25C and a total ...
January 25, 2010
An Initial amount of 100 grams of Thorium-234 decays according to the model: dP/dt=-0.02828P (where t is measured in years). a) Find the equation for the amount of Thorium left after t years. b) Determine the half-life of this radioactive isotope c) How long will it take for ...
October 12, 2009
I know that the definite article is normally used when discussing parts of the body, but I have oftentimes seen possessive adjectives with parts of the body while reading. Why is this? Is it just done for clarification? Thanks!
September 15, 2009
Can someone please check to make sure this is correct: Chère Famille Rosseau, Merci pour m'inviter rester chez vous! (should translate to "thank you for inviting me to stay at your house.") Merci beaucoup!
June 22, 2008
I am trying to help a friend and I understand the first part but I am really confused about what to do next!! This is what I have so far 10,000 x $0.69 = 6900 2,000 x $1.09 = 2180 4,000 x $0.99 = 3960 1,000 x $1.19 = 1190 2,000 x $1.09 = 2180 10,000 2,000 4,000 1,000 2,000 = ...
May 22, 2008
Can anyone proofread this paragraph and tell me if it is grammatically correct? Beaucoup de temps sont passés depuis la dernière fois que je tai vue! Jespère que tu vas bien. Aussi, veux-tu venir chez moi pour le révellion? Après ...
December 18, 2007
whats law of demand define satisfaction law of demand Definition If supply is held constant, an increase in demand leads to an increased market price, while a decrease in demand leads to a decreased market price. Source: http://www.investorwords.com/2734/law_of_demand.html
June 18, 2006