percentage error of the determination resulting from the presence of the Na2SO4
Complete problem : in a gravimetric determination of sulfur as BaSO4, 0.8863 g of the ignited precipiate is found to contain 7.71 mg of coprecipitated Na2SO4.
What was the weight of the sample used initially? Did you calculate % S. If so, what was the value?
You can calculate that 7.71 mg = 0.00771 g Na2SO4 converts to 0.0071 g x (molar mass BaSO4/molar mass Na2SO4) = 0.00771 x (233.34/142?) = ? and subtract from 0.8863. You can find the error in that easy enough. You need to redo the molar mass Na2SO4 to a better figures. I just remembered the whole numbers. Post your work if you get stuck.
To calculate the percentage error resulting from the presence of Na2SO4, you would need to know the experimental value of the measurement and the actual or desired value without the presence of Na2SO4.
The percentage error can be calculated using the following formula:
Percentage Error = (|Experimental Value - Actual Value| / Actual Value) x 100
Let's assume that the experimental value of the measurement in the presence of Na2SO4 is 10 and the actual/desired value without Na2SO4 is 8.
Using the formula, the calculation would be as follows:
Percentage Error = (|10 - 8| / 8) x 100
= (2 / 8) x 100
= 0.25 x 100
= 25%
Therefore, the percentage error resulting from the presence of Na2SO4 in this case is 25%.
To calculate the percentage error of a determination resulting from the presence of Na2SO4, you need to know the actual value and the measured value. The percentage error can be calculated using the formula:
Percentage error = (|Measured value - Actual value| / |Actual value|) * 100
Here's a step-by-step guide on how to calculate the percentage error:
1. Determine the actual value: This refers to the true or expected value of the parameter being measured. In this case, it would depend on what is being determined in the presence of Na2SO4.
2. Measure the value: Perform the experiment or measurement, taking into account the presence of Na2SO4. Record the measured value.
3. Calculate the absolute difference: Subtract the actual value from the measured value, and take the absolute value (ignoring any negative sign).
4. Calculate the percentage error: Divide the absolute difference by the absolute value of the actual value, then multiply by 100 to obtain the percentage.
For example, if the actual value is 10 and the measured value is 9, the absolute difference is |9 - 10| = 1. The percentage error would be (1 / 10) * 100 = 10%.
Remember to adjust the calculation based on the specific context and quantities involved in your determination.