Answer:
7,38 g of K₃PO₄
Explanation:
Molarity is an unit of chemical concentration. 0,139 M means 0,139 moles of solute per liter of solution.
In this case, the solute is potassium phosphate (K₃PO₄; molar mass: 212,27 g/mol) and the volume of the solution must be 250mL≡0,25L.
Thus, the moles of potassium phosphate you need are:
0,139 mol/L×0,25L = 0,03475 moles of K₃PO₄
In grams:
0,03475 moles of K₃PO₄ × 
= 7,38 g of K₃PO₄
I hope it helps!
p
K
a
=
5.4
pH
=
3.7
Explanation:
p
K
a
is simply
−
log
10
(
K
a
)
. It is a constant at any temperature and does not depend on the molarity of the solution.
p
K
a
=
−
log
10
(
K
a
)
=
−
log
10
(
4.0
×
10
−
6
)
=
5.4Explanation:
<span>When two metals touch in the mouth, a small shock is created. this is known as a </span>galvanic action
Answer:
Polyunsaturated
Explanation:
A fatty acid is a compound that is derivative from a carboxylic acid. The chain of carbons can have since 4 carbons to more than 20 carbons. The bonds between carbons can be simple, which are called saturated bonds, or double, or triple, which is called unsaturated bonds.
When a fatty acid only has saturated bonds between carbons, it's called a saturated fatty acid. If there is only one unsaturated bond, it's called an unsaturated fatty acid, and if there are two or more unsaturated bonds, it's called polyunsaturated fatty acid.
