He should add 10 ml of the 15% solution.

Nitric acid (HNO3) is not typically found in nature in its pure form. It is usually produced through industrial processes such as the oxidation of ammonia. However, nitric acid can be found in trace amounts in the atmosphere as a component of acid rain.

When copper reacts with nitric acid, the copper is oxidized by the nitric acid to form copper(II) nitrate, nitrogen dioxide gas, and water. The reaction is a redox reaction where the copper is oxidized and the nitric acid is reduced.

Of its simple inorganic compounds, lead sulphate and lead chloride are insoluble in water, so would be in nitric acid, which is mostly water. Lead monoxide and lead carbonate are not soluble, but react with the acid so they appear soluble.

Acetylcholine- it is widespread throughout the cerebral cortex, hippocampus and brain stem. Norepinephrine- it is located in the brain stem, particularly in the locus coeruleus of the midbrain; limbic system; some areas of the cerebral cortex. Dopamine- located in the substantia nigra of the midbrain; hypothalamus; is the principal neurotransmitter of the extrapyramidal system. Serotonin- Histamine ATP Andenosine GABA Glutamate Glycine Endorphines Tachykinins Somatostatin Nitic Oxide Acetylcholine- it is widespread throughout the cerebral cortex, hippocampus and brain stem. Norepinephrine- it is located in the brain stem, particularly in the locus coeruleus of the midbrain; limbic system; some areas of the cerebral cortex. Dopamine- located in the substantia nigra of the midbrain; hypothalamus; is the principal neurotransmitter of the extrapyramidal system. Serotonin- Histamine ATP Andenosine GABA Glutamate Glycine Endorphines Tachykinins Somatostatin Nitic Oxide

Three common acids found in the lab are hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3). These acids are frequently used in various laboratory procedures, such as pH adjustment, chemical synthesis, and titrations.

In HNO3 or nitric acid, there are three elements - hydrogen, nitrogen and oxygen. The atoms are present in the ratio 1:1:3. All three atoms are of non-metals.

HNO3 is an acid. It has 5 atoms. They are, Hydrogen, Nitrogen, Oxygen.

Nitrogen oxides primarily come from burning fossil fuels in vehicles and industrial processes, while sulfur dioxide is mainly produced by burning coal and oil for electricity generation and industrial activities. These pollutants combine with water vapor in the atmosphere to form acids which later fall as acid rain.

Esters have various uses, primarily in the fragrance industry as they contribute to the scent of fruits, flowers, and other products. They are also used as flavorings in food and beverages and as solvents in industries such as pharmaceuticals and cosmetics. Additionally, esters can be used as an intermediate in the production of polymers and plastics.

The density of nitrogen is 1,2504 g/L.
The density of air is 1,2922 g/L.
Both values are at 20 oC.