##### Asked by: Xuefen Hantzschmann

asked in category: General Last Updated: 9th January, 2020# How do you calculate a pipette error?

**Calculate**the

**accuracy**of the

**pipette**.

**calculate**the

**accuracy**you can use the

**equation**A = 100 x V

_{avg}/V

_{0}, where A is the

**accuracy**of the

**pipette**, V

_{avg}is the average

**calculated**volume and V

_{0}is the value you set the

**pipette**to dispense.

**Accuracy**should be between 99-101%.

In this manner, how do you find the percent error of a pipette?

**Calculate the percent error of your measurement.**

- Subtract one value from the other: 2.68 - 2.70 = -0.02.
- Depending on what you need, you may discard any negative sign (take the absolute value): 0.02.
- Divide the error by the true value:0.02/2.70 = 0.0074074.
- Multiply this value by 100% to obtain the percent error:

Similarly, how do you calculate uncertainty? To begin, simply square the value of each **uncertainty** source. Next, add them all together to **calculate** the sum (i.e. the sum of squares). Then, **calculate** the square-root of the summed value (i.e. the root sum of squares). The result will be your Combined **Uncertainty**.

Similarly, it is asked, what is the uncertainty of a pipette?

Uncertainty due to repeatability of pipetting u (V, REP) is equal to this standard deviation **0.0057 ml**. Pipetting is often used in titration analysis.

How do you stop pipetting errors?

**10 Ways to Prevent Pipetting Errors**

- Practice a smooth and slow motion.
- Pre-wet the pipette tip.
- Hold the pipette vertically when drawing in liquid and at a 45 degree angle when dispensing.
- Immerse the tip slightly into the liquid during aspiration.
- Touch off the pipette on the sidewall of the container.