Chemistry, 27.07.2019 23:00 hgl

When 25.0 ml of a solution of 1.4 x 10-3 m silver nitrate is mixed with 60.0 ml of a solution of 7.5 x 10-4 m sodium chloride a) what is the molar concentration of silver ions in the final mixture? b) what is the molar concentration of chloride ions in the final mixture? ksp (agcl) = 1.8 x 10-10

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Step one write the equation for dissociation of AgNO3 and NaCl

that is AgNO3> Ag+ + NO3-

NaCl> Na+ + Cl-
then find the number of moles of each compound
that is for AgNO3 = ( 1.4 x10^-3 ) x 25/1000= 3.5 x10^-5 moles
Nacl= (7.5 x10^-4)x 60/1000= 4.5 x10^-5 moles

from mole ratio the moles of Ag+= 3.5 x10^-5 moles and that of Cl-= 4.5 x10^-4 moles

then find the total volume of the mixture
that is 25ml + 60 Ml =85ml = 0.085 liters

The Ksp of Agcl = (Ag+) (cl-), let the concentration of Ag+ be represented by x and also the concentration be represented by x

ksp (1.8 x10^-10) is therefore= x^2

find the square root x=1.342 x10^-5

Ag+ in final mixture is = moles of Ag+/total volume - x
that is {(3.5 x10^-5)/0.085} - 1.342 x10^-5=3.98x10^-4

Cl- in the final mixture is =(4.5 x10^-5 /0.085) - 1.342 x10^-5= 5.16 x10^-4

Answer from: biancaTomas010B

First, we need to get moles of AgNO3:
moles of AgNO3 = molarity * volume
= 1.4x10^-3 M* 0.025 L
= 3.5x10^-5 moles

then, moles of NaCl = molarity * volume
= 7.5x10^-4 M * 0.06 L
= 4.5 x 10^-5 moles
by using this equation:
AgCl → Ag+ + Cl-
Ksp = [Ag+][Cl-]
when we have Ksp (AgCl) = 1.8x10^-10
and by assuming [Ag+] & [Cl-] = X so,by substitution:
1.8x10^-10 = X*X
X^2 = 1.8x10^-10
∴X = 1.3 x 10^-5
[Ag+] = [Cl-] = 1.3x10^-5 M

and when the total final volume = 0.025 L + 0.06 L = 0.085 L
∴ [Ag+] in the final mixture = ((3.5x10^-5) - (1.3x10^-5))/0.085L
= 2.5 x 10^-4 M
∴[Cl-] in the final mixture = ((4.5x10^-5) - (1.3x10^-5))/ 0.085 L
= 3.8 x 10^-4 M

Answer from: Quest

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

Answer from: Quest

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

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