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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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At this link:

http://www.chemteam.info/Thermochem/Time-Temperature-Graph.html

I discuss the five calculations you need to carry out in order to solve your problem. Be aware that I use different numbers for the mass and ending temperature and I use different heat capacity constants. So, make sure to use your values, not mine!

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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 >Weather >Open Question JASMINEW Member since:February 15, 2011Total points:41 (Level 1)In winter, after a snowstorm, salt (NaCl) is spread to melt the ice on roads. How many grams of salt per 1000. g of ice is needed to make it a liquid at -5 degree celsius?Answer Question

Be the first to answer this question.

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Which of the following has the greatest mass, in grams?

0.3 mol iron (Fe) atoms

1 atom of silver (Ag)

25 atoms of lead (Pb)

1 mole of hydrogen atoms (H)

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PCl5(g) + 87.9 kJ ---> PCl3(g) + Cl2(g)

A) 2.844 grams

B) 87.90 grams

C) 101.0 grams

D) 201.9 grams

E) 250.0 grams

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Sorry, I could not read the content fromt this page.

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