Can anyone help me with the theory of surface tension? My chemistry experiment is related to the surface tension and concentration of NaCl. I am confused about my hypothesis. On the internet, I found that increasing salt concentration also increases the surface tension of the water. But in my experiment, surface tension is decreasing with the increase of NaCl. So can anyone help me with the theory behind this?
With the help of needle and water drops, I was able to calculate the value of surface tension of water for each concentration of NaCl.