Why doesn't NaCl satisfy our thirst when drinking it?

NaCl is salt. Salt is ionic. It breaks down water.

Explanation:

It needs water to break it down, so it dehydrates you. It is also very polar.

Because it will cause you to urinate more

Explanation:

Salt like NaCl will turn into ion when absorbed. These ions will increase the osmotic pressure of the blood and in turn, will takes water around. If the volume of blood keeps increasing, it will increase the burden of heart to pump blood too. Ion also can alter electrolyte concentration and This condition can be dangerous if left without a response. The human body will try to eliminate the NaCl by filtering it using a kidney. But NaCl will take away water molecule so it increases the volume of urine you produce.

If the concentration of NaCl from the solution you drink is higher than the concentration of NaCl of the urine, you remove more water via urine than gain it from drinking.