It is very important in a titration to add the solution from the buret slowly so that the point at which the indicator changes color can be found accurately.

Add the titrating solution, mixing in one drop at a time by swirling the flask, until a color is seen throughout the solution that lasts for longer than 20 seconds. At this point, you have reached the endpoint and the titration is complete.

At 100°C, a pH value of 6.14 is the new neutral point on the pH scale at this higher temperature. [H+] also increases due to a decreased tendency of forming Hyderogen bonds, thus leading to a reduction in the pH.

Water is a slow conductor of heat, thus it needs to gain more energy than the sand or dry land in order for its temperature to increase. On the other hand, soil loses its heat much faster. Water has to lose more energy than the sand (dry land) in order for the temperature to decrease.

The pressure law states that for a constant volume of gas in a sealed container the temperature of the gas is directly proportional to its pressure. This means that they have more collisions with each other and the sides of the container and hence the pressure is increased.

The pressure of a given amount of gas is directly proportional to the temperature at a given volume. When the temperature of a system goes up, the pressure also goes up, and vice versa. The relationship between pressure and temperature of a gas is stated by the Gay-Lussac’s law.

In a closed system where volume is held constant, there is a direct relationship between Pressure and Temperature. Because there is less mass in the can with a constant volume, the pressure will decrease. This pressure decrease in the can results in a temperature decrease.

Temperature increases if average kinetic energy of particles increases. A change in volume will not affect the average kinetic energy of particles. Thus a change in pressure due to change in volume will not affect temperature.

For example, if you decrease the temperature of the gas by a greater degree than the decrease in pressure, the volume will decrease. However, if you decrease the pressure by a greater degree than the decrease in temperature, the volume will increase.

Cool temperatures cause air pressure to drop. When gas molecules cool, they move more slowly. Decreased velocity results in fewer collisions between molecules and air pressure decreases. The proximity results in collisions with less force and lower air pressure.

Because air is lifted instead of being pressed down, the movement of a cold front through a warm front is usually called a low-pressure system. Low-pressure systems often cause severe rainfall or thunderstorms. Warm fronts usually show up on the tail end of precipitation and fog.

Generally high pressure means fair weather, and low pressure means rain.

Hot air rises because gases expand as they heat up. When air heats up and expands, its density also decreases. The warmer, less dense air effectively floats on top of the colder, denser air below it. This creates a buoyant force that causes the warmer air to rise.

As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the air expands and becomes less dense (lighter). The opposite effect happens when air cools.

Cold air sinks. Sinking air compresses and heats. As air sinks, air pressure at the surface is raised. Cold air holds less moisture than warm.

Cold air flows downward according to hot air because it is more dense and sinks while hot air rises. In hot room the air will be much thinner thus reducing the pressure so the air flows from cold room to hot rooms.