They form a homogeneous mixture.
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When vinegar is added to water, the vinegar dissolves in the water, since vinegar is primarily acetic acid dissolved in water. This solution may lower the pH of the water, making it more acidic.
The solvent is usually the one that is present in large amount. So, if you had 1 ml vinegar and 10 ml water, then water is the solvent. If you have 1 ml water and 10 ml vinegar, then vinegar is the solvent. But recall that vinegar itself has water as the solvent, so it gets confusing.
Yes, water can dilute vinegar and change its pH level slightly. Adding water to vinegar will decrease its acidity, thus raising the pH level. However, the change may be minimal depending on the amount of water added.
When vinegar is added to baking soda, a chemical reaction occurs that produces carbon dioxide gas. This reaction is exothermic, meaning it releases heat, causing a slight increase in temperature.
When silver is added to water, it does not react with the water. Silver is a noble metal and is relatively unreactive with water at room temperature.
When a raw egg is left in a mixture of water and vinegar, the vinegar dissolves the eggshell which is made of calcium carbonate. This leaves the egg membrane intact, causing it to become rubbery and transparent.