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yarga [219]
3 years ago
11

How many moles of water molecules are in 57.43 g of iron (iii) chloride dihydrate

Chemistry
1 answer:
Kobotan [32]3 years ago
6 0

Explanation:

im not sure all I know is 1.81 x 1024

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The ka values for several weak acids are given below. which acid (and its conjugate base) would be the best buffer at ph = 8.0?
Pie
One of the best buffer choice for pH = 8.0 is Tris with Ka value of  6.3 x 10^-9.

To support this answer, we first calculate for the pKa value as the negative logarithm of the Ka value: 
     pKa = -log Ka

For Tris, which is an abbreviation for 2-Amino-2-hydroxymethyl-propane-1,3 -diol and has a Ka value of 6.3 x 10^-9, the pKa is
     pKa = -log Ka
            = -log (6.3x10^-9)
            = 8.2

We know that buffers work best when pH is equal to pKa:
     pKa = 8.2 = pH 

Therefore Tris would be a best buffer at pH = 8.0.
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3 years ago
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What type of ion does the substance give off if it turns the pH paper blue?
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Answer:

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Explanation:

In an alkaline solution, red litmus paper turns blue. When an alkaline compound dissolves in water, it produces hydroxide ions, which cause the solution to become alkaline.

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What does the atomic mass of an element on the periodic table represent?
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The atomic mass on the periodic table represents the sum of number of protons and number of neutrons.

Atomic mass = Number of protons + number of neutrons

Hope this helps!
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Noble gases will not bond with other atoms because of this reason?
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