If BaSO4 ppt is isn't washed or dried adequately how will this effect the sulfate percent error determination?
If the BaSO4 precipitate (ppt) is not washed or dried adequately, it can have several effects on the sulfate percent error determination. Let me explain how:
1. Contamination: Inadequate washing of the BaSO4 ppt can result in the presence of impurities or contaminants, such as excess reagents or undesired substances. These impurities can introduce additional mass to the precipitate, leading to an overestimation of the sulfate content and therefore an error in the percent determination.
2. Moisture content: Inadequate drying of the BaSO4 ppt can cause residual moisture to be present. Moisture adds to the mass of the precipitate, leading to an overestimation of the sulfate content. This can result in a higher percent error, as the measured mass of BaSO4 obtained will be higher than it should be.
3. Incomplete conversion: Inadequate washing and drying can also result in incomplete conversion of the sulfate precipitate. Unconverted sulfate ions may remain in the sample, which would lead to an underestimation of the actual sulfate content. This would result in a lower percent error, as the measured mass of BaSO4 obtained will be lower than it should be.
To minimize these errors in the sulfate percent determination, it is important to ensure proper washing and drying of the BaSO4 precipitate. This can be achieved by carefully decanting the supernatant liquid after the precipitation, washing the precipitate multiple times with an appropriate solvent, and ensuring thorough drying of the precipitate, such as using a desiccator or an oven at a controlled temperature.
By following these steps and ensuring adequate washing and drying, you can improve the accuracy of the sulfate percent determination.