School and Work

A) ph electrode and a reference electrode are placed in the solution and it is titrated wih .1 M NaOH. Data for the titration curve are gathered and plotted. The inflection point of the plot is at 34.6 ml. How many moles of NaOH were used to neutralize the weak acid and how many moles of weak acid were present in the same? what is the molecular mass of this weak acid?

c) assuming that the pH meter is accurately standardized, which of the following three measurements will give the more reliable value for the Ka of this weak acid? 1) at the start of titration 2) at the midpoint of the titration, or 3) at the end point of the titration. explain

E) the pH of the misture was 3.78 when 12.0 mL of NaOH was added. what is the Ka of the weak acid?

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Home >All Categories > Science & Mathematics >Engineering >Open Question Edward Member since:April 21, 2011Total points:95 (Level 1)Installed a standing column Geothermal well 8" diameter 600ft deep. I am considering drilling a second well to supplement the capacity of the first well. Since i am looking for energy efficiency i was thinking of siphoning water from 1 well to the next. The first well would pump water through the heat pumps and dump back into the new well. The draw down and subsequent return of the water to the new well will create the pressure for the siphon to flow and equalize the well levels. Can a siphon be held over the long term?Answer Question

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Some questions:
I want to measure the rate of H2 produced, so I need a metal and acid that react together well, but not too quickly or else I won't have time to record how much H2 is being produced. What metals could I use?

Also

Will this work? Can I collect H2 gas by downward displacement of water?

Thanks

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(15.4 g / 18.0 g/mol) times 6.02 kJ/mol = 5.15 kJ = 5150 J

5150 J = (316 g) (?t) (4.184 J/g C)

?t = 3.90 C

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Home >All Categories > Science & Mathematics >Chemistry >Open Question Donegald... Member since:March 29, 2011Total points:122 (Level 1)I need help with this it is an assignment for uni and cant figure it out. I know I need 15,884 j to heat the water, and that the molar mass of the sodium acetate is 82.03. What enthalpy change do I need, and what is the formula? The assignment is to design a pocket hand warmer, any help would be great.Answer Question

by Muppet Member since:June 30, 2010Total points:6,781 (Level 5)What , are you a little terrorist ?

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(1)Hello, this is my question. how many moles of oxygen gas (O2) are needed to produce 36.04 grams of water (H2O) when reacting with excess ethane in the equation 2C2H6 + 7O2 5CO2 + 6H2O?
A. 19.0 moles of oxygen (O2)
B. 14.0 moles of oxygen (O2)
C. 2.3 moles of oxygen (O2)
D. 1.2 moles of oxygen (O2)

How many moles of water would be produced from the reaction of 3.25 moles of hydrochloric acid racting with excess calcium hydroxide?
help me please!

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Home >All Categories > Science & Mathematics >Biology >Open Question by Greg Member since:April 08, 2011Total points:102 (Level 1)Water does have colour - blue. It's just so weak that you don't see it unless it is in large abundance such as in oceans or lakes. The reason? Because of the way that the bonding in the water interacts with light. It's not merely a reflection of the sky.

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FULL QUESTION: Many seed eating rodents and birds in extreme deserts don’t have access to liquid water and instead manage to get adequate water from:

a.air
b.dew
c.soil
d.respiration
e.blood

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The vapor pressure of pure water at 25°C is 23.8 mm Hg. What is the vapor pressure
of water above a solution made by dissolving 18.0 g of glucose (a nonelectrolyte with a molar mass of 180.0 g/mol) in 95.0 g H2O?

Could someone explain to me how to figure this out? Thanks

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a.) Evaporation.

b.) Condensation.

c.) Melting.

d.) Freezing.

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a.) results in a lower specific humidity

b.) the more readily the air is to rise if nudged

c.) the shallower the depth of the air mass

d.) All of the responses are true.

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How did the cat find out it liked fish in the first place? Okay - I know some cats like water but that is rare. You can't tell me there was one water-loving cat who caught fish and fed the rest of the cats and that's how they got so fond of fish eatin!

So - how come they like to eat fish but hate water?

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