# What is the trick to calculating pH?

## What is the pH of a 2.5 x10 6 M solution of HCL?

[H+] = 10−5.6 ≈ 0.0000025 = 2.51 × 10−6 M. We can always check our solution by computing −log (2.5 × 10−6) ≈ 5.6.

## How do you find the pH of NaOH?

Calculating pH Work out -log[0.1] = 1. Next, apply the formula pH + pOH = 14. To isolate the pH, work out 14 – 1 = 13. The pH of your NaOH solution is 13.

## How do you calculate pH from titration?

For a Strong Acid-Strong Base titration, there are three possibilities: If there is excess HA at the end of the reaction, calculate its new molarity. Then, use p H = − log ⁡ [ H 3 O + ] to solve for pH. If there is excess OH – at the end of the reaction, calculate its new molarity.

## How do you solve pOH and pH problems?

In order to calculate the pH, take the negative log of the hydronium ion concentration. To find the pOH, simply subtract the pH from 14. In order to calculate the pOH, take the negative log of the hydroxide ion concentration. To find the pH, simply subtract pOH from 14.

## What is the pH of 10 6 M NaOH?

If x is small, then [H+]=5.476×10−8M and pH=7.26 . So yes, the approximation is good.

## What is the pH of 0.010 M NaOH?

Weak Acids and Bases. The pH of 0.010 M NaOH is about 12.

## What is the pH of a 1.0 x10 9 M solution of HCl?

Hence, the pH of 1 × 10-9 M HCl solution is 6.99.

## What is the pH of H2O?

The pH of pure water (H20) is 7 at 25 °C, but when exposed to the carbon dioxide in the atmosphere this equilibrium results in a pH of approximately 5.2 because CO2 in the air dissolves in the water and forms carbonic acid.

## What is the pH of NaCl?

NaCl aqueous solution is formed by NaOH and HCl which are strong base and strong acid respectively. So they will completely dissociate and neutralise each other. So the pH will be 7.

## How do you calculate pH before titrant?

To find the pH, first simply find the moles of excess H3O+. The excess can be calculated by subtracting initial moles of analyte B from moles of acidic titrant added, assuming a one-to-one stoichiometric ratio. Once the number of moles of excess H3O+ is determined, [H3O+] can be calculated.

## What is the titration formula?

Use the titration formula. If the titrant and analyte have a 1:1 mole ratio, the formula is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base. (Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.)

## How do you calculate pH from ion concentration?

The pH is the negative log of the hydrogen ion concentration; thus, for [H+] = 3.0 X 10-3, pH = 2.52. Example: a. Calculate the pH of a solution with a hydrogen ion concentration of 0.00040 M.

## What is the concentration of H+ in a solution with a pH of 4?

This means, for example, that a hydrogen-ion concentration of a solution with a pH of 4 is 10-4mol/l, meaning it contains 0.0001 mol of hydrogen ions in a solution of 1 liter.

## What is the pH of 0.1 M KOH?

If concentration of KOH is 0.1 M, pH value may be 13.

## What is the pH of a 0.0001 M hno3 solution?

pH=−log10[H+]−log10[0. 0001]=−log10[10−4]=4.

## What is the pH of 0.02 m NaOH?

pOH=−log10(OH)−=−log10(0.02)pOH=1.70pH+pOH=14⇒pH=14−1.70=12.3pH=12.3.

## What is the pH of 0.1 m HCl?

Strong Acids and Bases pH of 0.1 M HCl = 1, etc.

## What is the pH of 0.02 M HCl?

For example: What is the pH of a 0.020 M HCl solution? Answer: HCl is a strong acid, it dissociates 100% (I.e. completely): [HCl]F = 0.020 M = [H3O+] So, pH = – log [H3O+] = -log [HCl]F = -log(. 020)=1.70 Voila!