I am first assuming that you want the molarity of the acid. Use the formula
![M_{a} V_{a} = M_{b}V_{b}](https://tex.z-dn.net/?f=M_%7Ba%7D%20V_%7Ba%7D%20%3D%20M_%7Bb%7DV_%7Bb%7D)
which is the titration formula. M is molarity (a is of acid and b is of base) and V is volume in mL (a is of acid and b is of base). Plugging in gives us
![(29 mL)(M_{a}) = (0.130 M)(27.73 mL)](https://tex.z-dn.net/?f=%2829%20mL%29%28M_%7Ba%7D%29%20%3D%20%280.130%20M%29%2827.73%20mL%29)
. Solving gives us
The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.
Modern periodic table is based on atomic number. Thus, the properties of elements are related to their atomic number or electronic configuration. Elements are arranged according to increasing order of atomic number. Elements with similar properties occur at regular intervals in the periodic table. The cause of periodicity in properties is due to recurrence of similar outer electronic configuration at certain regular intervals.
Explanation:
We can tell if a chemical reaction has taken place when one or more of the following things happen:
1.There has been a colour change inside the reaction flask.
2. A gas has formed. Usually we know a gas has formed when we can see bubbles.
3.A solid has formed.
hope this answer helps!!!
Answer:
Ka = 1.5 × 10⁻⁵
Explanation:
Butyric acid is a weak acid that ionizes according to the following equation:
CH₃-CH₂-CH₂-COOH(aq) ⇄ CH₃-CH₂-CH₂-COO⁻(aq) + H⁺(aq)
We can find the value of the acid dissociation constant (Ka) using the following expression:
![Ka=\frac{[H^{+}]^{2} }{Ca}](https://tex.z-dn.net/?f=Ka%3D%5Cfrac%7B%5BH%5E%7B%2B%7D%5D%5E%7B2%7D%20%7D%7BCa%7D)
where
[H⁺] is the molar concentration of H⁺
Ca is the initial molar concentration of the acid
We can find [H⁺] from the pH.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.71 = 1.95 × 10⁻³ M
Then,
![Ka=\frac{(1.95 \times 10^{-3})^{2} }{0.25} =1.5 \times 10^{-5}](https://tex.z-dn.net/?f=Ka%3D%5Cfrac%7B%281.95%20%5Ctimes%2010%5E%7B-3%7D%29%5E%7B2%7D%20%7D%7B0.25%7D%20%3D1.5%20%5Ctimes%2010%5E%7B-5%7D)