One of the assays your laboratory carries out requires a 2N…

One of the assays your laboratory carries out requires a 2N HCl.  You have a stock bottle of concentrated HCl with a specific gravity of 1.18 and purity of 36%.  What volume of the concentrated HCl is required to make 250mL of the 2N HCl (MW of HCl = 36.5 Da)?

Which of the following statements correctly compares and con…

Which of the following statements correctly compares and contrasts a-priori and a-posteriori methods of reference individual selection? 1. In both methods, exclusion and partitioning take place after sampling and analyte testing. 2. A-priori methods require fewer reference individuals to be studied than a-posteriori methods. 3. Questionnaires for potential reference individuals must be more detailed for a-posteriori methods than for a-priori methods.