Complete the calculations below based on the following student data. A student following the procedure similar to that in this lab prepared four solutions by adding 12.25, 23.00, 25.50, and 34.50 mL of 8.25 x 10-2 M NaOH solution to 50.00 mL of a 0.152 M solution of weak acid. The solutions were labeled 1, 2, 3, and 4 respectively. Each of the solutions was diluted to a total volume of 250 mL with DI water. The pH readings of these solutions were: (1) 6.64 (2) 6.98 (3) 7.04 (4) 7.23. PRE-LAB DATA SHEET
1 2 3 4
Initial number of moles
HAn(aq)
OH-(aq)
Number of moles at equilibrium
HAn(aq)
An-(aq)
Equilibrium concentrations, mol/L
HAn(aq)
An-(aq)
H3O-(aq)
Ka
Average Ka
Which of the weak acids in Table 1 do you think your unknown acid is?

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet