Obtain 48 ml 2.9 M NaCl solution and dilute it by adding 75 ml water. What is the final concentration (in M) after such

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Obtain 48 ml 2.9 M NaCl solution and dilute it by adding 75 ml
water. What is the final concentration (in M) after such
dilution?
Keep two digits after decimal.
23.3 mL of unknown HCl solution was titrated by 0.15 M of NaOH.
37.76 mL of that NaOH solution was consumed to exactly neutralize
the acid. What is the original concentration (in M) of the unknown
HCl solution?
(Keep two digits after decimal.)