Salt is necessary to give flavor to the pasta. As discussed here,
http://eat-italian.blogspot.com/2010/03/how-much-salt-for-cooking-pasta.html
you need a tea spoon of salt for two cup of water or 1/2 tea spoon for each cup of water
It depends on how much pasta you are cooking. For a pound, you should use a couple big pinches. As a rule of thumb, it should be like sea water.
When boiling the water for spaghetti, you can add about a teaspoon of salt.
This depends on the recipe, producer and your taste.
salt and tomato
Nothing. The salt you add to pasta adds flavor to the pasta. You'd still have pasta that looks and tastes exactly like pasta, just with less salt in it. There is a misconception that salt reduces the boiling point of water, when in fact the opposite is true.
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It's good to add a pinch of salt and a few drops of olive oil into the water when cooking pasta. The olive oil is especially useful, because it makes sure that the pasta doesn't stick together when boiling it, so you don't ruin it when you take it out.
yes the salt raises the temperature to boil faster
Dried pasta has a better shelf live. Fresh pasta will cook much faster. Fresh pasta has to be refrigerated while dried pasta can be kept on the shelf.
depends on how much pasta you want, less pasta smaller pot, more pasta the bigger the pot....easy concept
If you add too much salt to the water what ever you cook in that water will also be salty. Pasta cooked in over salted water will result in salty pasta. The same applies to any startch cooked in over salted water. You want to add just enough salt to add a little flavour to the item you are cooking.
I have no idea. It makes precious little difference. The sauce is what counts!!
It will be approximately 2 cups after cooking.
No, oil does not keep the pasta from sticking together. The oil has a much higher viscosity and will just float on top. However, the oil can serve a purpose in cooking pasta. If the pot of pasta is left on high heat, the oil will prevent the pasta from foaming and then eventually boiling over. When pastas are cooked, the starches are released into the water and begin to stick together. The oil allows the starchy particles to slide past each other instead of sticking together. An alternative is to periodically stir the pasta as it is cooking to keep it from clumping together.
They are all different, but roughly double in weight after cooking