Consider the following balanced chemical equation, KCl(aq) AgNO3(aq) → AgCl(s) KNO3(aq)When a sample of impure potassium chlorid
1 answer:
Answer:
In the original sample there's 72.78% KCl
Explanation:
KCl(aq) + AgNO₃(aq) → AgCl(s) + KNO₃(aq)
- To solve this problem we need to calculate the mass of <em>pure</em> potasssium chloride. To do that we calculate the moles of KCl that reacted into AgCl:
1.26 g AgCl *
- Now with the molecular weight of KCl, we can calculate the mass of KCl that reacted:
8.792 * 10⁻³ mol KCl * 74.55 g/mol = 0.655 g KCl
- Finally we divide the mass of <em>pure</em> KCl by the mass of the sample, to calculate the percentage KCl:
0.655 / 0.900 * 100% = 72.78%
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Answer:
0.0400 g for the example given below.
Explanation:
pH value is not provided, so we'll solve this problem in a general case and then we will use an example to justify it.
- By definition,
.
- NaOH is a strong base, as it's a hydroxide formed with a group 1A metal, so it dissociates fully in water by the equation:
.
- From the equation above, using stoichiometry we can tell that the molarity of hydroxide is equal to the molarity of NaOH:
.
- Concentration of hydroxide is then equal to the ratio of moles of NaOH and the volume of the given solution. Moles themselves are equal to mass over molar mass, so we obtain:
.
- We also know that
. Take the antilog of both sides:
.
- Solve for the mass of NaOH:
.
Now, let's say that pH is given as 12.00 and we use a 100-ml volumetric flask. Then we would obtain:
Barium : 
with +2 being the charge
Oxygen :
with -2 being the charge
The given equation can be written as:
Ba + O = BaO
Since the sum charges of Barium and Oxygen equals 0, there is no need to add subscripts.
Both Ba and O appear on the left and right side of the equation once, so there is no need to add a coefficient.
Ba + O = BaO is balanced
Oxygen :
The given equation can be written as:
Ba + O = BaO
Since the sum charges of Barium and Oxygen equals 0, there is no need to add subscripts.
Both Ba and O appear on the left and right side of the equation once, so there is no need to add a coefficient.
Ba + O = BaO is balanced