<span>Pb(NO3)2(aq) + 2 KCl(aq) ==> PbCl2(s) + 2 KNO3(aq)
Let's write the balanced equation
lead(II) nitrate is Pb(NO3)2
potassium chloride is KCl
lead(II) chloride is PbCl2
potassium nitrate is KNO3
So the basic equation is
Pb(NO3)2 + KCl ==> PbCl2 + KNO3
But it's not balanced. I see 2 nitrogen on the left and 1 nitrogen on the right. So add a coefficient to the KNO3, getting
Pb(NO3)2 + KCl ==> PbCl2 + 2 KNO3
Now there's only 1 potassium on the left, but 2 on the right. So add another coefficient, getting
Pb(NO3)2 + 2 KCl ==> PbCl2 + 2 KNO3
And it's balanced. Now to include the physical states.
Pb(NO3)2 is soluble in water, so it's state will be (aq)
KCl is also soluble in water, so it too will be (aq)
PbCl2 is poorly soluble in water. So it will become a solid precipitate. It's state will be (s)
KNO3 is quite soluble in water with it's solubility increasing rapidly with higher temperatures. So it's state will be (aq).
So let's add the states to the reactants and products.
Pb(NO3)2(aq) + 2 KCl(aq) ==> PbCl2(s) + 2 KNO3(aq)</span>
Answer:
We need 78.9 mL of the 19.0 M NaOH solution
Explanation:
Step 1: Data given
Molarity of the original NaOH solution = 19.0 M
Molarity of the NaOH solution we want to prepare = 3.0 M
Volume of the NaOH solution we want to prepare = 500 mL = 0.500 L
Step 2: Calculate volume of the 19.0 M NaOH solution needed
C1*V1 = C2*V2
⇒with C1 = the concentration of the original NaOH solution = 19.0 M
⇒with V1 = the volume of the original NaOH solution = TO BE DETERMINED
⇒with C2 = the concentration of the NaOH solution we want to prepare = 3.0 M
⇒with V2 = the volume of the NaOH solution we want to prepare = 500 mL = 0.500 L
19.0 M * V2 = 3.0 M * 0.500 L
V2 = (3.0 M * 0.500L) / 19.0 M
V2 = 0.0789 L
We need 0.0789 L
This is 0.0789 * 10^3 mL = 78.9 mL
We need 78.9 mL of the 19.0 M NaOH solution
Answer:
Solubility refers to the maximum amount of solute that dissolves in a given amount of solvent at a particular temperature Factors Affecting Solubility 1. Effect of Temperature For some substances to dissolve in a given solvent, heat is absorbed. The reaction is endothermic. In this case, an increase in temperature increases solubility.
Explanation:
4x − 8x= −3
Step 1: Simplify both sides of the equation.
4x−8x = −3
4x + −8x= −3
(4x + −8x) = −3 (Combine Like Terms)
−4x = −3
Step 2: Divide both sides by -4.
−4x / −4
−3
- / −4
so your answer will be x= 3/4
.
This question is about momentum conservation, which belong to physics subject.
You start by assuming that the friction coefficient of bwtween the roller skates and the ice is very low and think there is not friction.
Under those circumstances the convservation of momentum implies:
1) When the roller skater throws the 2 kg balls, it will acquire a momentum equal to v*2kg and the skater will acquire equal momentum in the opposite direction.
That means that the skater will step back and away from the other skater.
2) When the second skater receives the ball with momentum 2kg*v, he will move backward also and further away.
In conclusion, the two skaters will end standing more than 5 m apart facing each other.