Which of the following given statements is NOT true? 1. Oxygen from the air does not dissolve in large bodies of water. Lajos Winkler developed the Winkler Titration Method to determine the amount of dissolved oxygen in water. The purpose of the sulfuric acid in the experiment on determining the dissolved oxygen in a water sample is to make the sample acidic. 2. Deeper levels of water often do not reach 100% air saturation equilibrium because they are not shallow enough to be affected by the waves and photosynthesis at the surface. The dissolved oxygen content is an important index when considering its suitability for town supply. An acidic solution will have a pH greater than 7. Which of the following given statements is true? 3. During and after the collection of the sample of water to be used in the DO determination, it is advisable for the flask with water to contain bubbles. In DO determination, 100% air saturation means that the water is holding more dissolved gas molecules than it can in equilibrium. The thermocline is the depth at which water temperature begins to decline.
Ionic Equilibrium
Chemical equilibrium and ionic equilibrium are two major concepts in chemistry. Ionic equilibrium deals with the equilibrium involved in an ionization process while chemical equilibrium deals with the equilibrium during a chemical change. Ionic equilibrium is established between the ions and unionized species in a system. Understanding the concept of ionic equilibrium is very important to answer the questions related to certain chemical reactions in chemistry.
Arrhenius Acid
Arrhenius acid act as a good electrolyte as it dissociates to its respective ions in the aqueous solutions. Keeping it similar to the general acid properties, Arrhenius acid also neutralizes bases and turns litmus paper into red.
Bronsted Lowry Base In Inorganic Chemistry
Bronsted-Lowry base in inorganic chemistry is any chemical substance that can accept a proton from the other chemical substance it is reacting with.
Which of the following given statements is NOT true?
1. Oxygen from the air does not dissolve in large bodies of water.
Lajos Winkler developed the Winkler Titration Method to determine the amount of dissolved oxygen in water.
The purpose of the sulfuric acid in the experiment on determining the dissolved oxygen in a water sample is to make the sample acidic.
2. Deeper levels of water often do not reach 100% air saturation equilibrium because they are not shallow enough to be affected by the waves and photosynthesis at the surface.
The dissolved oxygen content is an important index when considering its suitability for town supply.
An acidic solution will have a pH greater than 7.
Which of the following given statements is true?
3. During and after the collection of the sample of water to be used in the DO determination, it is advisable for the flask with water to contain bubbles.
In DO determination, 100% air saturation means that the water is holding more dissolved gas molecules than it can in equilibrium.
The thermocline is the depth at which water temperature begins to decline.
4. Dissolved oxygen in large bodies of water may be from the waste product of photosynthesis from algae, seaweed, and other aquatic plants.
The normality (N) of a solution is determined by multiplying the molarity of the solution by its volume.
In the Winkler Titration Method, the endpoint is determined by the visual indicator, methyl violet.
5. In the experiment on the determination of dissolved oxygen in water, the brown hydrated precipitate that formed in the process of oxygen fixation was magnesium hydroxide.
From the air, oxygen can slowly diffuse across the water’s surface from the surrounding atmosphere, or be mixed in quickly through aeration, whether natural or man-made.
In the experiment on dissolved oxygen determination, the tips of the pipettes should be well above the surface of the liquid when introducing various reagents into the full bottle of sample.
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