Answer:
Solution A is a Weak Alkali, Solution B is a strong Acid.
Explanation:
At pH 10, the colour is blue, therefore it's a weak alkali.
At pH 1, the colour is red, therefore it's a strong Acid.
Answer:
= 29.64 g NaNO3
Explanation:
Molarity is given by the formula;
Molarity = Moles/Volume in liters
Therefore;
Number of moles = Molarity × Volume in liters
= 1.55 M × 0.225 L
= 0.34875 moles NaNO3
Thus; 0.34875 moles of NaNO3 is needed equivalent to;
= 0.34875 moles × 84.99 g/mol
= 29.64 g
DNA replication? I think that would make the most sense.
The number of grams of copper reacted is 445 grams
<u><em>calculation</em></u>
2Cu +O₂ → 2CuO
from equation above the mole ratio of Cu:CUO is 2:2 =1:1, therefore the moles of Cu is also= 7.00 moles
mass=moles x molar mass
from periodic table the molar mass of Cu= 63.5 g/mol
mass= 7.00 moles x 63.5 g/mol =445 grams
The value of E°cell and ∆G is 0.74V and 133.53kJ respectively.
node reaction (oxidation reaction)
Cd ------ Cd(+2) + 2e-
Cathode reaction (reduction reaction)
Cu(+2) + 2e- -------- Cu
Redox reaction
Cu(+2) + Cd ------- Cu + Cd(2+)
E°cell = E° cathode - E° anode
E°cathode = 0.34V
E°anode = -0. 40 V
E° cell = 0.34 - (-0.40)
E°cell = 0.74V
∆G° = - n FE° cell
= -2 × 96485 × 0.74
= -142798 J
= - 142.8 kJ
∆G° = -142. 8 kJ
∆G° = R T in K
= -142. 8 = - 8.314 × 10 ^ -3 × 298 × In k
Ink = 57.64
K = 1.08 × 10 ^25
b) Cd(s) + Cu+2 (aq) ------- Cd+2 (aq) + Cu (s)
E cell = E° cell - (0. 0591 /2) log (Cd+2 /Cu+2)
= 0.74V – (0.0591/2) log(1.95/0.05)
= 0.692 V.
∆G = -n F Ecell
= -2 × 96485 × 0.692
= 133.53kJ
Thus, we found that the value of E°cell and ∆G is 0.74V and 133.53kJ respectively.
learn more about voltaic cell or electrolytic cell:
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