(1). pH = 1.70 (2). pH = 2.3 (3). pH = 3.3 (4). pH = 4.3 (5). pH = 8.41 (6). pH = 10.22. The explanation indicates that the acid is represented by H₂A, and the titration curve shows clear transitions at both equivalence points due to the following reactions: H₂A + OH⁻ → HA⁻ + H₂O and HA⁻ + OH⁻ → A²⁻ + H₂O. Calculations conclude with the corresponding pH values at specified points.
Answer:
evaporated
Explanation:
Once the solution evaporates, only salt will remain, as the sole other component in the solution is water.
<span>(NH4)2CO3 -> 96.09 g/mol
(6.995g ammonium carbonate)(1mol ammonium carbonate/ 96.09 g ammonium carbonate) = 0.072796 mol ammonium carbonate
In this calculation, the unit 'grams' cancels out as it's present in both the numerator and the denominator, leading to 'mol' being the remaining unit.
Examining the formula (NH4)2CO3, it can be interpreted as:
2 mol (NH4) + 1 mol (CO3) = 1 mol (NH4)2CO3
This means every mole of ammonium carbonate yields one mole of carbonate ions and two moles of ammonium ions.
(0.072796 mol ammonium carbonate) = (0.072796 mol carbonate ion) + (0.363981 mol ammonium ion) </span>
The issue with your setup is that the surface where you placed the drop is contaminated or dirty, preventing it from being wetted by the solution. To fix this, thoroughly clean the surface before applying the drop.
