Acid Base Heat Of Solution

Rhododendrons, 'King of Shrubs,' thrives in our climate

Rhododendrons, frequently called the “King of Shrubs” and regarded by many as the best flowering evergreen plants, are especially well-suited to our climate on Staten Island. Their showy spring blossoms and deep green foliage, attractive in all seasons, make Rhododendrons stand out in the landscape at any time of the year.

All Azaleas are Rhododendrons. They belong to the genus Rhododendron and are members of the Heath family, which includes Heath and Heathers, Blueberries, Mountain Laurels and many others. These acid-loving plants appreciate good drainage and a soil high in organic matter or humus.

Rhododendrons have big, shiny, leathery evergreen leaves and clusters of large pink, white, apricot, pale orange or purplish flowers. They don’t appreciate full, hot sun and won’t thrive in complete shade either, so for best results select an area which will get morning sun and afternoon shade.

Early spring planting of Rhododendrons is recommended. Your plants may be purchased in a container or wrapped in burlap. Before planting, soak the plant thoroughly in a tub of water. If the plant is root-bound, loosen and cut some of the outer roots to encourage new roots to grow into the new soil. Hosing off the soil from the outer roots can be beneficial in aiding them to become well-established in their new home.

Burlap may be left on the root ball; anything fabricated with plastic or another non-biodegradable material should be removed before planting, as should any plastic cord or string. Your container-grown plant may have encircling roots that will need to be cut and outer roots that will need to be loosened in order to make good contact with the new soil. The addition of oak leaves, pine needles or other acid-type compost, is helpful when growing Rhododendrons.

GO EASY ON THE ROOTS

Avoid planting your Rhododendron too deep, and be careful when handling the easily damaged roots. The top of the root ball should be even with the surface of the ground or 1 to 2 inches above the surface. Never plant Rhododendrons deeper than they were grown in the nursery.

Since Rhododendrons are shallow-rooted, their roots can easily dry out during the hot summer months. They should be well-watered, especially during the first growing season when the roots haven’t gotten out of their original root ball and into the surrounding soil.

Their very fine roots will take longer to merge into the new planting bed than many other plants, and for this reason will not be able to easily draw water except from the original root ball. If this ball is permitted to dry out, your new Rhododendron will have much difficulty in getting wet again. A solution is to place a hose at the base of the plant and slowly let the water trickle into the planting bed.

Your Questions About Sodium Hydroxide Solution Density

[PH = -log[H+], and H+ is the species in solution that makes a solution acidic. If you have a deficiency of H+ then you have a basic solution. If the [H+] = [OH-] then you have a neutral solution and it is neither acidic nor basic.]

3. In an acid base titration, the primary standard is highly pure acid, highly pure base, either highly pure acid or highly pure base, or is neither base nor acid. T(1/2) = 7.04 x 10^8 years. (units are important). Half-life means that in 1 half-life you will lose 1/2 or 50% of the Uranium. In 2 half-lifes you will have (1/2)(1/2) = 1/4 or 25% of the original amount of uranium-235. Assumptions are: 1. The amount of Uranium-235 we started with. 2. The rate of radioactive decay has always been the same(no way to check this). 3. None of the decay products have been removed or added to the sample since time began.

5. A student found the heat of solution for sodium hydroxide to be -41.8 kj/mol. The accepted value is -44.0kj/mol. What is the percent error?

% error = (|experimental value – accepted value|/accepted value)*100% Question about moles?

1.) How many moles of atoms are there in 42.0 grams of zinc?

2.) How many molecules are in .596 moles of carbon dioxide?

3.) 1.4 moles of sodium hydroxide are needed to make a solution for a lab. How many grams of NaOH are needed?

4.) The mass of a solid copper penny is 3.46 g. How many copper atoms are in the penny?

5.) A helium balloon contains 16.9 L of helium. If each mole occupies 22.4 L, how many atoms of helium are in the balloon?

6.) A vitamin contains .300 g calcium. Find the number of calcium atoms in it.

7.) What is the mass of 8.07 x 10^24 molecules of O2?

8.) Determine the volume of 2.6 mol sample of aluminum if the density of aluminum is 2.07 g/cm3.

9.) Calculate the moles present in 14.7 g calcium nitrate.

10.) One type of penicillin has the formula C14H20N2SO4. How many molecules of penicillin are in a pill containing 300 mg?

First person to give me all correct answers gets 10 points, thanks!

“First person to give me all correct answers gets 10 points…”

Not gonna happen. No one wants to do your homework for you. We don’t mind offering some help so that you can understand some sticky point of chemistry, but we don’t want you to miss out on the fun and educational value of actually doing the work yourself.

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