Is rain acidic or alkaline?

Rainwater is weakly acidic, carbon dioxide in the air reacts with water to produce carbonic acid, carbonic acid is weakly acidic, so rainwater is weakly acidic, and the pH value is about. Rainwater is affected by many natural phenomena in nature, which can cause the pH value to vary between, so the pH value less than is called acid rain.

Rainwater is an indispensable part of the earth's water cycle and is the most important freshwater resource for human life. Rain usually comes in four forms: frontal rain, convective rain, topographic rain, and typhoon rain.

Rain irrigates crops, reduces dust in the air, and lowers temperatures. However, too much rain can cause natural disasters such as landslides and mudslides. It can also cause water levels in reservoirs, rivers and lakes to skyrocket, causing flooding.

Rain is the evaporation of water on the surface of land and sea into water vapor, water vapor rises to a certain height and becomes small water droplets when cold, these small water droplets form clouds, they collide with each other in the clouds, merge into large water droplets, when it is too big for the air to support, it falls from the clouds, forming rain.

Rain can occur in a variety of ways, from drizzle to continuous rain and downpour showers. Rain usually comes in four forms: frontal rain, convective rain, topographic rain, and typhoon rain.

Rain is a natural precipitation phenomenon, the most important freshwater resource in human life, and an indispensable part of the earth.

Rainwater is weakly acidic.

The normal should be weakly acidic, because the atmosphere contains a large amount of CO2, so the normal rain itself is slightly acidic, the pH value is about , and the pH value in the rainwater is generally less than is called acid rain. In some special cases, rain is affected by many natural phenomena in nature, which can cause the pH value to vary between, so the pH value is less than that should be regarded as acid rain.

Acidic for sure.

If the air quality in the area is good, the water will also become very acidic due to the dissolution of small amounts of CO2. If the air quality is not good, there may be more SO2, H2S, NO, N2O, NO2 or NO2, and the result is acidic.

Weakly alkaline.

The pH of saliva is about the same as being slightly alkaline. Normally, the daily amount of saliva secretion should be 1Milliliter.

The human body will constantly produce some acidic substances or some alkaline substances in the normal metabolic process, therefore, the blood pH value of normal people is between, so it also belongs to alkaline constitution.

Water is neither acidic nor alkaline.

The pH of tap water.

It depends on the region, but the water in most cities is neutral.

However, if it is water in nature, there will be a certain concentration of carbon dioxide in it.

And some chlorine will be added to the water for disinfection, which will cause the water to become weakly acidic in some places.

Measurement method

Add pH indicator to the solution to be tested, different indicators will change color according to different pH, for example: drop the acidic solution into the litmus solution, the litmus solution will turn red; If the alkaline solution is dropped into the litmus solution, the litmus solution will turn blue (the litmus solution will not change color when it encounters a neutral liquid). Based on the study of the indicator, the pH range can be determined.

Will be colorless phenolphthalein.

The solution drops into an acidic or neutral solution, and the color does not change; The colorless phenolphthalein solution was dropped into the alkaline solution, and the solution turned red. Note: When adding a pH indicator to the colored solution to be measured, a pH indicator that can produce significant color difference should be selected.

Use pH test strips.

pH test strips have a wide range of test strips and precision test strips, dip a little solution to be tested with a glass rod onto the test strip, and then change according to the color of the test strip and compare the color card.

The pH of the solution can also be obtained. The ** above is equivalent to a colorimetric card.

1. Water is alkaline, and water in nature, such as spring water, lake water, etc., is generally weakly alkaline water, because nature has endowed it with rich minerals and trace elements.

2. And pure water, as the name suggests, has nothing in the water except water molecules, and the water nature is naturally acidic. The artificial mineral water that is now popular on the market has destroyed the acid-base balance of the water due to the artificial addition of minerals, and is even more acidic than pure water.

Rainwater is acidic, and due to the presence of carbon dioxide in the air, it reacts with water to form carbonic acid, making normal rainwater slightly acidic.

Rain, the second of the 24 solar terms, is located around the 15th day of the first lunar month (February 18-20 of the Gregorian calendar). The Sun is located at 330° ecliptic longitude. On this day, the daughter, who is usually married, goes home to visit her parents, and gives her mother a piece of red silk and a pot of stewed meat.

Rain, the second of the 24 solar terms, is located around the 15th day of the first lunar month (February 18-20 of the Gregorian calendar). The Sun is located at 330° ecliptic longitude.

Rain is the second of the 24 solar terms. Around the fifteenth day of the first lunar month (February 18-20 of the Gregorian calendar), when the ecliptic longitude of the sun reaches 330 degrees, it is the rain of the 24 solar terms.