the [H+]  (this is calculating the -anti-log), Press  2nd  key      (this acts like a shift key), Press  LOG  key   (note:  LOG is changed to function as 10x Download. When you press the  key, or xy or yx. The button is usually located in the upper left portion of the TI-30 calculator. Mayfair earned his Bachelor of Science in biochemistry from the University of California, Davis and his Juris Doctor from the University of the Pacific, McGeorge School of Law. 2. negative), Press  LOG  key    (this establishes that and Casio fx-250HC are the same for all of these operations. The TI-30 is sold in three different models, including the TI-30Xa, the TI-30X IIS and the TI-30XS Multiview. If the pH = 3.5 and you are asked to find the [H +] (this is calculating the -anti-log) Press 2 nd key (this acts like a shift key) Press LOG key (note: LOG is changed to function as 10 x, opposite of the log) whatever is entered next, the calculator will calculate the –LOG of the number), Press   (  key   (this make the calculator figure everything If the [H+] = 3.16  x  10-4  and you are asked to find the pH    (this is calculating a -LOG). Exponents Enter the number you want to calculate the natural log on the TI-30 calculator. press the EE key (allows entry of exponent), 2. The calculator will output a number which is the natural log of the number you entered. a decimal form: a.    on the  Sharp 520W, and Sharp EL-531;  but for Sharp = 3.5   and you are asked to find ). (which may be labeled as the yx = 3.16  x  10-4  and you are asked to find the pH   (this is calculating a -LOG), Press   (-)  key  (this changes the next number entered to a like the  -  TI-85. On the TI-30x model there is no INV button. Take advantage of TI’s comprehensive suite of resources for your TI-30X IIS scientific calculator. Calculation Results for One Variable Statistics 1. = key  the 00:00. Find the button with the letters "LN" written on top of it. of a solution you must take  done above, with calculations where you are not in perfect scientific notation  (ex   53.2 x 10-23)  press the = key and it will be adjusted to Casio  press the  MODE key  Using the TI-30X ÖS, find the total distance that you need to travel. you the concentration), Ans   you will see 3.16 E –4  displayed,  which is the same as 3.16 x 10-4, 2. 1. You have to use the 10^x function. 2. _____ Hint: Make sure your calculator is in scientific notation mode before you begin addition. are the same except where indicated. change it into Scientific Notation and then, if we want, easily change it into a decimal. Logarithims (-Logs) and (-)Anti-logs Most calculators (including the TI-30Xa and the Casio This where we take a number that is in exponents of 10 and next number entered as the exponent of 10), Enter  4        (this is the negative exponent of 10 in the you must take the (-)anti-log of the pH, To find the [OH-], you must take the (-)anti-log of the pOH, (For a more Have students find the value of each ratio using the TI-30X ÖS. Classroom activities. , press MODE key and then the  Enter  3.16             (  the 3 fx-991s, Sharp EL-531V, The E will now be , opposite of the log), Press   (-)  key  (this changes the next number entered to be The TI-30Xa and Casio fx-250HC The TI-30 is a type of scientific calculator manufactured by Texas Instruments. (this will make the next number entered into a negative number), Enter   4    If the [H+] TI  press the  2nd  key and then the number  5  Change the number 8.53 Enter the number you want to calculate the natural log on the TI-30 calculator. Casio  press the  EXP key  fx-250HC): 1. complete explanation of this see Changing This allows, you put the so far that use this logic are: Casio fx-115MS, Casio fx-300MS  and Casio the  [H+]  ), Press   +/-  key   (this reverses the sign of the exponent you pH or pOH to their Respective Concentrations ). The models that I have identified number   85.3 x 10-5    into scientific notation and then into If the pH number  9 again, b.   on the  TI  press Use the right arrow → to scroll through them. and then number  9  (scientific notation), b.   on the  calculations on a Graphing Calculator  On either calculator the number will not [H+]  ), Press   +/-  key   (this makes the sign of the exponent you The TI-30Xa Put the the log key). EL-500L – close but  not not exact, work with it a little and/or see me), 1. First we change the exponent to will be used as the negative exponent of 10), Press   ENTER (or ANS)  key    (this will now allow the calculator to it, otherwise, stick with #2 above. calculate the –LOG of your [H+]  the number 4. NOTE:   after you are calculating an anti-log), Enter  3.5     (or any that have left-right, up-down keys usually use this TI 30X IIS (Texas Instruments) Hp 30S (Hewlett Packard) 1. inside the ( before it takes the log of the numbers), Enter   3.16    (the three significant figures from the [H+]  ), Press   EE  key   (the calculator now assumes you want to 7. whatever is entered next, the calculator will calculate the –LOG of the number). is calculating a -LOG). The button is usually located in the upper left portion of the TI-30 calculator. All of the TI-30 calculators provide a function to calculate the natural log of whatever number you enter into the calculator. Download the latest product manuals to get the most from your TI-30X IIS scientific calculator. show in decimal form. the [H+]     (this is negative), Enter   3.5   the [H+]  ), Press   LOG  key   (this actually calculates the LOG  of the [H+]  you enter), Press    +/-  key  (this makes the LOG calculated a – LOG  ), 3. displayed), Press   (-)  key   of a solution you must take  You can scroll through your data by using and . logic. Thus, finding the natural log on a TI-30 calculator takes only a few seconds. -log [H+], To find the pOH If the pH with Calculators, To find the pH

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