# I don’t know how to answer the prelab?Prelab Questions

(PL1) . 0.00025M Bromothymol Blue

Question

# I don’t know how to answer the pre-lab?Prelab Questions : (PL1) . 0.00025M Bromothymol Blue

solution is diluted when it is mixed with HCl or NaOH. Calculate the concentration of BTB after it is mixed with HCl or NaOH for C1-C6. Use M1V1=M2V2.

(PL2) For C1 –C3, the lab is assuming that 100% of BTB are in acidic form, leaving 0% of BTB in basic form. What is the concentration of acidic form of BTB in C1 to C3?

(PL3) For C4 –C6, the lab is assuming that 100% of BTB are in basic form, leaving 0% of BTB in acidic form. What is the concentration of basic form of BTB in C4 to C5?

(PL4) Calculate the concentration of bromothymol blue after K2HPO4 and KH2PO4 are added for solutions, S7 – S11? Use M1V1=M2V2.

(PL5) For solution S7, if 30% of BTB are in acidic form, what is the concentration of acidic form of BTB in S7? What is the concentration of BTB basic form?

(PL6) If the solution reads pH 7.66, calculate the [H+1]