Answer:
<h2><em>An </em><em>element</em><em> </em><em>and</em><em> </em><em>a </em><em>compound</em><em> </em><em>are </em><em>mixtures</em><em>.</em></h2>
Answer:
1 m/s
Explanation:
speed=wavelength*frequency
speed=0.5*2
speed=1
- A buffer solution resists the change in pH after the addition of small amounts of acid or base to it.
- The given buffer solution is NaHCO₃ (acid) + Na₂CO₃ (conjugate base).
- NaHCO₃ contains HCO₃⁻ and Na⁺ ions. Na₂CO₃ contains Na⁺ and CO₃²⁻ ions. Na⁺ ions do not show any effect on the pH of a solution.
Therefore, HCO₃⁻ and CO₃²⁻ are responsible for the buffer action.
HCO₃⁻ is the acidic component of the buffer. It neutralizes the small amounts of base added to it producing an equivalent amount of the conjugate base CO₃²⁻.
HCO₃⁻(aq) + OH⁻(aq) → CO₃²⁻(aq) + H₂O(l)
Acid conjugate base
CO₃²⁻ is the basic component if the buffer. It neutralizes the small amounts of acid added to it producing an equivalent amount of the conjugate acid HCO₃⁻
CO₃²⁻(aq) + H₃O⁺(aq) → HCO₃⁻(aq) + H₂O(l)
Base Conjugate acid
- Therefore, even after the addition of a small amount of acid or base to the buffer, pH remains unchanged.
Answer:
The answer to your question is pH = 1.93, acid.
Explanation:
Data
[OH⁻] = 8.6 x 10⁻¹³
pH = ?
Process
pH measures the [H⁺] concentration. The pH scale goes from 0 to 14. If the pH of a solution goes from 0 to 6.9 the solution is acidic, it the pH = 7.0, the solution is neutral or if the pH is between 7.1 and 14 the solution is basic.
1.- Calculate the pOH
pOH = -log [OH⁻]
-Substitution
pOH = -log[8.6 x10⁻¹³]
pOH = 12.06
2.- Calculate the pH
pH + pOH = 14
-Solve for pH
pH = 14 - pOH
-Substitution
pH = 14 - 12.06
-Result
pH = 1.93
3.- Conclusion
This solution is an acid.
Circle-Thus a circle has the largest area of any closed figure with a given perimeter