The answer is C, because wind turbines are used to produce electricity, and it's also the most safest way--but they are expensive.
Answer:
There is 86.1 mL of KCl needed
Explanation:
<u>Step 1:</u> Data given
Molarity of KCl = 0.244 M
Volume of a 0.210 M Pb(NO3)2 = 50.0 mL = 0.05 L
<u>Step 2:</u> The balanced equation
2KCl(aq) + Pb(NO3)2(aq) -> PbCl2(s) + 2KNO3(aq)
<u>Step 3:</u> Calculate moles Pb(NO3)2
moles Pb(NO3)2 =molarity * volume
moles Pb(NO3)2 = 0.210 M * 0.05 L
moles Pb(NO3)2 = 0.0105 moles
<u>Step 4:</u> Calculate moles of KCl
For 1 mole of Pb(NO3)2 we need 2 moles of KCl
moles KCl required = 0.0105 * 2 =0.0210 moles
<u>Step 5:</u> Calculate volume of KCl
Volume = moles KCl / molarity KCl
V = 0.0210 moles / 0.244 M=0.0861 L = 86.1 mL
There is 86.1 mL of KCl needed
A 0.00143 M concentration of MnO4^- is not a reasonable solution .
<h3>Number of moles of carbonate</h3>
The ions left in solution are Na^+ and NO3^-
Number of moles of calcium nitrate = 100/1000 L × 1 = 0.1 moles
Since;
1 mole of sodium carbonate reacts with 1 mole of calcium nitrate then 0.1 moles of sodium carbonate were used.
<h3>Conductivity of filtrate</h3>
The claim of the student that the concentration of sodium carbonate is too low is wrong because the value was calculated from concentration and volume of calcium nitrate and not using the precipitate. If the filtrate is tested for conductivity, it will be found to conduct electricity because it contains sodium and NO3 ions.
2) In the reaction as shown, the MnO4^- ion was reduced.
The initial volume is 3.4 mL while the final volume is 29.6 mL.
Number of moles of MnO4^- ion = (29.6 mL - 3.4 mL)/1000 × 0.0235 M = 0.0006157 moles
<h3>The calculations are performed as follows</h3>
- If 2 moles of MnO4^- reacted with 5 moles of acid
0.0006157 moles of MnO4^- reacted with 0.0006157 moles × 5 moles/ 2 moles
= 0.0015 moles
- In this case, number of moles of acid = 0.139 g/90 g/mol = 0.0015 moles
Number of moles of MnO4^- = 0.00143 M × (29.6 mL - 3.4 mL)/1000
= 0.000037 moles
- If 2 moles of MnO4^- reacts with 5 moles of acid
0.000037 moles of MnO4^- reacts with 0.000037 moles × 5 moles/ 2 moles
= 0.000093 moles
- Hence, this is not a reasonable amount of solution.
Learn more about MnO4^- : brainly.com/question/10887629
1. This can be due to the dissolving of the solid in liquid and form a solution.
Dissolving is a physical property because dissolving doesn't form new substances and the chemical composition of the solid is not changed.
The color building up over the time can be due to the rate of dissolving of the solid and amount of particles have been dissolved.
Example:
- Dissolving of CuSO₄ solid in water.
- This develops a blue color.
2. This can be due to the chemical reaction between the solid and liquid.
Chemical reaction is a chemical property because from reacting substances new substances can be formed which the chemical formula is different from initial substances.
The color building up over the time can be due to the rate of the reaction and the amount of reactants.
Example:
- The reaction between calcium metal with water.
- The color of Ca(OH)₂ is white color.
- Reaction is
Ca(s) + 2H₂O(l) → Ca(OH)₂(aq) + H₂(g)
