Please solve the following. Write neatly. Thank you!

Question 11 ( 2 points) Question 13 ( 2 points) Which statement about sample preparation is FALSE? If you have a 50-ml buret, the mass of water delivered from it is 49.891g, the lab It might be necessary to remove interfering species prior to analysis. temperature is 19C, find the volume of water delivered by the pipet. The volume of 1g of water at 19C is 1.0026mL. Express the answer with 5S.F, no units and All if the statements are false. no scientific notation. None of the statements is false. Samples with a dilute concentration might need to be concentrated prior analysis. 50.000mL49.891mL Samples may need to be dissolved. Samples need to have a high concentration of analyte. None of those 49.762mL50.021mL Question 14 (2 points) What is the variance for the data in Table 1. Rupoort the answer to three decimal placei