When calcium is allowed to react with nitrogen, calcium nitride is formed. If 24.0 g of calcium and 12.0 g of nitrogen are avail
1 answer:
You might be interested in
Answer:
The weight percent of potassium carbonate is 50,8 wt% and of potassium bicarbonate 49,2 wt%
Explanation:
The reactions of potassium carbonate (K₂CO₃) and potassium bicarbonate (KHCO₃) with HCl produce:
K₂CO₃ + 2HCl → 2KCl + CO₂ + H₂O
KHCO₃ + HCl → KCl + CO₂ + H₂O
That means that you need 2 moles of HCl to titrate potassium carbonate and 1 mol to titrate potassium bicarbonate.
The moles of HCl to titrate the mixture are:
0,03416L× = <em>0,02603 mol of HCl</em>
If X is mass of K₂CO₃ and Y is mass of KHCO₃ in the mixture, the moles of HCl to titrate the mixture are equals to:
0,02603 mol = 2X× + Y×
<em>(1)</em>
As the mass of the mixture is 2,122g:
2,122g = X + Y <em>(2)</em>
Replacing (2) in (1):
0,02603 mol = 0,01447 (2,122-Y) + 9,988x10⁻³Y
0,02603 mol = 0,0307 - 0,01447Y + 9,988x10⁻³Y
-4,6778x10⁻³ = -4,4827x10⁻³Y
1,044g = Y <em>-mass of potassium bicarbonate-</em>
Thus:
X = 1,078g <em>-mass of potassium carbonate-</em>
The weight percent of potassium carbonate is:
×100 =<em> 50,8 wt%</em>
The weight percent of potassium bicarbonate is:
×100 = <em>49,2 wt%</em>
<em></em>
I hope it helps!
Cystine is dimer of Cystein amino acid formed by oxidation reaction. Its main function is to provide mechanical strength to proteins and allow them to retain their 3-D structures and also serves as a substrate for the cystine-glutamate antiporter.
As shown in figure cystine has two amino groups (highlighted blue) and two carboxylic groups (highlighted green). In its original structure cystine is neutral in nature as it has equal number of basic (NH₂) and acidic (COOH) moieties along with two chiral centers (asymmetric carbons) highlighted with red spots.
When one -NH₂ group is replaced by -COOH group the cystine is converted into an acidic compound with three COOH groups and a NH₂ group. Also, one asymmetric carbon will convert into a symmetrical carbon with a loss of one chiral carbon.
In second step, when another NH₂ is replaced by COOH, the acidic strength of resulting compound will increase along with conversion of last chiral carbon into symmetric carbon.
Therefore, the final structure will be acidic in nature with zero chiral carbons as shown in figure attached below.
<u>Answer:</u> The concentration of KOH solution is 1.215 M
<u>Explanation:</u>
For the given chemical equation:
To calculate the concentration of base, we use the equation given by neutralization reaction:
where,
are the n-factor, molarity and volume of acid which is
are the n-factor, molarity and volume of base which is KOH.
We are given:
Putting values in above equation, we get:
Hence, the concentration of KOH solution is 1.215 M