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Vedmedyk [2.9K]
3 years ago
8

How can one tell, just by looking at the titration curve of an acid titrated by a strong base (with no calculations), if the ana

lyte was a weak acid or a strong acid?
Chemistry
1 answer:
mezya [45]3 years ago
8 0
One can tell by looking at the titration curve of an acid and base whether the acid used is a strong acid or a weak acid. For a titration of a strong acid and a strong base, the pH at the equivalence point will be neutral, that is, pH 7. If the titration involves a weak acid and a strong base, the pH at the equivalence point will not be neutral, the solution will be basic at the equivalence point.
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6.
ki77a [65]

Answer:

4Na  +   O₂  →   2Na₂O  

6.82g

Explanation:

The combustion of sodium involves combining the element with oxygen gas:

              4Na  +   O₂  →   2Na₂O  

We have been given 5g of Na.

The balanced reaction equation is given as shown above. This reaction is also a synthesis or combination reaction.

b. Maximum amount of product that can be obtained.

Sodium is the limiting reactant and it will determine the amount of product that can be formed.

  To solve this, we find the number of moles of the given sodium.

  Mass of given sodium  = 5g

    Molar mass of Na  = 23g/mol

  Number of moles of Na  = \frac{mass}{molar mass}  

Insert the parameters and solve;

 Number of moles of Na  = \frac{5}{23}    = 0.217moles

  From the balanced reaction equation:

         4 moles of Na will produce 2 moles of Na₂O  

      0.217 moles of Na will produce \frac{0.217 x 2}{4}   = 0.11mole of Na₂O  

So;

 Mass of Na₂O   = number of moles x molar mass

    Molar mass of Na₂O   = 2(23) + 16  = 62g/mol

 Mass of Na₂O   = 0.11 x 62  = 6.82g

6 0
3 years ago
What is the mass, in grams, of one mole of any substance known as? (please help!)
kotegsom [21]
B.




Explanation: Molar mass: the mass in grams of one mole of any substance (elements or compounds). Also known as atomic mass, atomic weight, molecular weight (MW), and formula weight (FW), but these terms can be misleading. 1 mole 12C = 6.022 x 1023 atoms 12C = 12 g 12C. 12C is defined to be exactly 12 g.
5 0
2 years ago
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