Problem: The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.130 M NaOH. What volume of NaOH is needed to reach the endpoint of the titration? What was the initial concentration of HCl?

FREE Expert Solution

Let’s first write the balanced reaction between HCl and NaOH:

▪ HCl → strong binary acid
▪ NaOH → (OH- with Group 1A ion) → strong base
▪ the reaction between a strong base and strong acid → no need to create an ICE chart

Balanced reaction:              HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)



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Problem Details

The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.130 M NaOH. What volume of NaOH is needed to reach the endpoint of the titration? 

What was the initial concentration of HCl?


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