55.5 mol/L

In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture. A concentration can be any kind of chemical mixture, but most frequently solutes and solvents in solutions. The molar (amount) concentration has variants such as normal concentration and osmotic concentration.

1 Answer. We know that the mass of 1000 mL of water is 1000 g, and the molecular weight of water is around 18 gmol−1, therefore the calculation gives us an answer of 55.5 mol.

Because the equilibrium is used for calculating the concentrations of weak acids, very little water actually reacts. The concentration of water during the reaction is, therefore, a constant, and can be excluded from the expression for K. It is simply K multiplied by the concentration of water.

When dealing with the effect of concentration changes it is important to realize that you cannot change the concentration of a pure solid, or a pure liquid. For example, a glass of pure water always has a concentration of 100 % pure water. Adding more of the solid to a saturated solution has no effect.

So little of the water is ionised at any one time, that its concentration remains virtually unchanged – a constant. Kw is defined to avoid making the expression unnecessarily complicated by including another constant in it. Like any other equilibrium constant, the value of Kw varies with temperature.

Water and pH This means that the molar concentrations of H + and OH – are approximately 10 – 7 each in pure water. Therefore, a H + concentration of 10 – 7 M has a pH of 7.0. In pure water, there are always equal numbers of H + and OH – , and the pH is defined to be neutral.

The overall concentration of hydrogen ions is inversely related to its pH and can be measured on the pH scale (Figure 1). Therefore, the more hydrogen ions present, the lower the pH; conversely, the fewer hydrogen ions, the higher the pH.

Solution 4: Distilled water is neutral. We can verify that by dipping red or blue litmus paper. There will be no change in colour due to neutral nature.

pH electrodes will NOT give accurate pH values in distilled or deionized water because distilled and deionized water do not have enough ions present for the electrode to function properly. The actual pH, therefore, will typically be slightly less than 7.

Some sources say that lemon water has an alkalizing effect, meaning that it can neutralize stomach acid, which may reduce acid reflux. However, this is not backed up by research. Lemon juice is acidic, with a pH of 3, while water has a pH of around 7, which is neutral. This means it is neither acidic nor alkaline.