An acid of known strength, HA, is used in a titration to determine the concentration of a solution of NaOH. What ions are present in the flask at the equivalence point?

What are the choices?

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

The surface of the water droplet is held together by the attraction between molecules. in order for water to flow more easily into these small spaces, you need to decrease its surface tension. you can do this by adding soap, which is a surfactant (a material that decreases the surface tension of a liquid).