Answer:
pH = 11.36
Explanation:
Before the addition of any HCl, you have 0.300M NH₃ in equilibrium with water:
NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)
When system is in equilibrium:
Kb = 1.8x10⁻⁵ = [NH₄⁺] [OH⁻] / [NH₃]
Concentrations in equilibrium are:
[NH₃] = 0.300M - X
[NH₄⁺] = X
[OH⁻] = X
1.8x10⁻⁵ = [X] [X] / [0.300M - X]
5.4x10⁻⁶ - 1.8x10⁻⁵X = X²
X² + 1.8x10⁻⁵X - 5.4x10⁻⁶ = 0
Solving for X:
X = -0.00233 → False answer, there is no negative concentrations
X = 0.00231 → Right answer.
As [OH⁻] = X; [OH⁻] = 0.00231
As pOH = -log [OH⁻] = 2.636
14 = pOH + pH
14 - pOH = pH
<em>pH = 11.36 </em>
Next time submit a picture or answer questions, so we can figure out what you need.
The wood has undergone a chemical change and has been transfered into energy and gas. Also, the smoke coming from the fire comes from the wood
Answer:
Test for carbon dioxide gas.
The reaction between baking soda and citric acid will form sodium ions, citric acid ions, carbon dioxide gas, and water. So all you have to do is add the gas produced (by gas displacement method or something) and test whether the gas is carbon dioxide, with lime water or other methods like hydrogencarbonate indicator. Hope this helped!
Explanation:
We can dictate the mechanism of the reaction by looking at the exponents of the reactants in the reaction rate equation. Since [xy] has an exponent of 1, then the reaction follows the first order reaction with respect to xy. Similarly, the reaction follows the first order with respect to z₂. Then, the overall is the sum of each of their orders which is 2.