Dalia, age 13 wrote:
Some of the required materials were available but the others I tried different materials instead of them. It was a nice experiment. When I did it I observed that the more salt I add the sound of the buzzer become loudly. Also, when I put the sticks closer it also rang loudly. In addition, I found that all of the salt particles were attracted toward the aluminum foil. So the conclusion is that from the properties of ionic compounds is the electrical conductivity.

Abdul, age 13 of Jeddah, Saudi Arabia wrote:
after I followed the instructions it really buzzed. after that I didn't believe my eyes or ears finally it was a good topic to do.

Nouran, age 13 wrote:
Only water with salt worked. Water didn't work alone.

Mariam, age 13 of Jeddah, Saudi Arabia wrote:
The buuzzer buzzed in saltwater, but it didn't in th pure water. That means it is an electric conductor when dissolved in water or melted and that is because it is an ionic compound.

Raneem, age 13 wrote:
It worked in salty water because the salt dissolved into ions, and ions can carry electricity. While in water nothing happened with it.

Shurug, age 14 of Jeddah, Saudi Arabia wrote:
First, I covered the straws (I used straw instead of a popsicle sticks) using the aluminum foil. Instead of buzzer, I used light bulb, and I have to provide wires to connect the bulb into the battery, the first wire for the positive end of the battery and to the bulb. Then the other wire for the bulb and to the negative end of the battery. After that, I put the tips of the aluminum foil into the saltwater, and the bulb lit. So that's it. It's very easy, and interesting. I tried it on the water without salt but the bulb did not lit.

Mrs. H's Class, age 9 of IL wrote:
Our class did this experiment in science lab. We tested vinegar, chocolate milk, sugar water, salt water, cherry Pepsi and bottled spring water. We used 6 different testers, 4 buzzers and 2 motors. Results: vinegar-yes, chocolate milk-yes, sugar water-no, salt water-yes, cherry Pepsi-yes, bottled water-no. This was awesome. Some of us got different results, that's why we tried different motors and buzzers. The salt water was our control. Science rocks!

Ms. L's Class, age 12 of IL wrote:
Our class divided into 6 teams and each team built a saltwater tester. We had 2 different kinds of buzzers and 2 motors. We got mostly the same results in each team except for vinegar and bottled water. We think the bottled water got contaminated by the cherry Pepsi. But vinegar, chocolate milk, salt water and cherry Pepsi were definite yes for salt and the others were no. Our hypothesis was that chocolate milk does not have salt, but we were wrong! We love science!!

Mrs. L's Class, age 9 of IL wrote:
We tested 6 different liquids for salt. We liked building the saltwater tester. We used the scientific method to do this experiment. We found that vinegar, chocolate milk, salt water and cherry Pepsi all have salt in them. Sugar water and bottled water do not. Our teams work great together in science lab. Go science!!

Mrs. M's Class, age 9 of IL wrote:
We worked with our team in science lab to build the saltwater tester. We used the scientific method and predicted that chocolate milk and bottled water most likely would not have salt in them. Our hypothesis about the chocolate milk was wrong. It has lots of salt in it! Cherry Pepsi and saltwater and vinegar do too! We love science! It's fun to do experiments and discover new things.

Mrs. A's Class, age 12 of IL wrote:
We thought it was cool to build the saltwater tester then use it in different liquids. Our hypothesis was wrong about bottled water. We thought it contained salt but it doesn't! Three teams thought chocolate milk didn't have salt in it and 3 teams thought it did. So half of the teams' predictions were correct. It's fun to learn science with experiments!

Mrs. J's Class, age 9 of IL wrote:
We love science! We love experiments! This experiment was fun to do in science lab. We built 6 different testers then tested 6 different liquids. Our hypothesis was that vinegar and chocolate milk wouldn't have salt but that was wrong. They have LOTS of salt! We predicted correctly about the other liquids, so our hypotheses were right on those. Science rocks!!

Mr. N's Class, age 12 of IL wrote:
We did this experiment in science lab and liked building the testers. Our hypotheses were almost all correct about all the different liquids we tested. Chocolate milk, vinegar and cherry Pepsi all have salt in them. Of course, so does salt water. That was our control liquid. Some of us are going to build the tester at home and try other liquids like orange juice and white milk. Science is fun!!

Yu, age 8 of New York, NY wrote:
The saltwater tester buzzed when I put it in the salt water, it also buzzed when I put it in vinegar, it didn't buzz in fresh water or cold sugar water. It also buzzed in sugar water.

Madelyn, age 4 of Chicago, IL wrote:
Plain water no. Salt water yes. Sugar water no. Oxy Clean water yes.

Jaeden, age 10 of Brush Prairie, WA wrote:
i tried it but I added something to it. I put sugar in the water and baking soda and it was awesome.

Motasem, age 12 of Paterson, NJ wrote:
i used a light bulb instead of a buzzer and it worked.

Carolina, age 12 of Mount Vernon, NY wrote:
it was so easy. i've done it so many times yet it is interesting.

Ekene, age 10 of Baltimore, MD wrote:
I didnt feel any buzz I checked it twice but anyway it was really cool thanks for saving my butt!!!

Maggie, age 12 of Scranton, PA wrote:
when I did I used it for a 6th grade science project. it worked I had to use masking tape. you had to hold the wire on the stick it didnt stay but the expeirement worked I was so happy

Courtney, age 11 of Killen, TX wrote:
this saltwater tester was so cool I shrade it with all of my frineds and they thoght it was so cool too I touck some picers and sod my franeds. the night I staed at my fraends house we were wathing it and we soll it and she saed this project is so cool so I thought that I wouild give you a email and tell all about and how cool it was

Keisha, age 11 of New York wrote:
when I did this experiment I found it very cool now I do this with everything I drin

Amanda, age 12 of Paterson, NJ wrote:
i loved doing that project. it was sooooooo cool. my teacher loved it when she saw it.

Aspen, age 10 of Matamores, PA wrote:
When I did it I other kinds of things such as jelly, dish soap, and apple juice some of them buzzed some didn't. It worked great!

Nami, age 10 of Wallington, NJ wrote:
it worked and it was awsome now I use it to see if my poland spring water has salt!

Tuli, age 9 of Virginia Beach, VA wrote:
I tested it in different liquids, and the buzzer went off. It even went off with bottle water and my tap water??? I didn't understand why? I am going to change the foil and do it again... wish me luck.

Emilio, age 11 of Medford, OR wrote:
it worked salt water made it buzz fresh water didnt that was cool thanks!

Mariam, age 10 of Carteret, NJ wrote:
I used a 6volt battery and buzzer along with other liquids such as vinegar, saltwater, oil and water. They all worked except for the oil!