A student starts the titration of HCI with NaOH, but he forgot to add the phenol
ID: 1048846 • Letter: A
Question
A student starts the titration of HCI with NaOH, but he forgot to add the phenolphthalein to the add solution. When he remembers this omission, he adds the phenolphthalein to the Erlenmeyer flask, and the solution immediately turns pink. Explain why this student will need to start the titration over again. Write the balanced chemical equation for the neutralization reaction that occurs between nitric add [HNO_3] and calcium hydroxide (Ca(OH)_2]. A student carries out the titration of H_2SO_4 with NaOH. She finds that it takes 19.87 ml of0.2091 M NaOH to reach the endpoing using 15.00 mL of H_2SO_4. Use this information to calculate the molarity of the H_2SO_4. The balanced equation for this reaction appears below: H_2 So_4 (aq) + 2 NaOH(aq) rightarrow Na_2SO_4(aq) + 2 H_2O(l)Explanation / Answer
2) Ca(OH)2 + 2 HNO3---------------------------> Ca(NO3)2 +2 H2O
3) H2SO4
M1=?
V1= 15 ml
n1=1 mole
NaOH
M2=0.2091M
V2=19.87
n2= 2
M1V1/n1 = M2V2/n2
M1*15/1 = 0.2091*19.87/2
M1= 0.138M
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