A 0.8345 g sample of potassium hydrogen phthalate
required 38.31 mL of 0.1023 M NaOH to reach the
endpoint. What is the concentration (M) of NaOH?

• A 10.00 mL sample of an HCl solution to be used as an
acid standard required 28.45 mL of the previously
standardized NaOH to reach the endpoint. What is the
concentration of the HCl solution?

10.94 mL of KOH solution is required to titrate 0.5361 g of potassium hydrogen phthalate (KHP; FW=204.224) to the Phenolphthalein endpoint. If 27.96 mL of this solution is required to titrate 96.34 mL of HCl to the Phenolphthalein endpoint, what is the concentration of the HCl solution?

__________ M

Please show all steps. Thanks!

A solution of NaOH was standardized by titration of a knownquantity of the primary standard potassium hydrogen phthalate (KHP)which has a formula of KC8H5O4.
The NaOH was then used to find the concentration of an unknownsolution of H2SO4.
Titration of 0.824g of KHP required 38.314g of NaOH solution toreach the endpoint detected by phenolphthalein indicator. Determinethe concentration of NaOH expressed as mol NaOH/g solution. A 10mLsample of H2SO4 was found to require 57.911g of the NaOH solutionto reach the phenolphthalein end point. Find the molarity of theH2SO4.